From 8c1737e627c6722431e60ddd76f9f42030904544 Mon Sep 17 00:00:00 2001
From: CI <toni@data-intuitive.com>
Date: Tue, 14 Jan 2025 11:49:24 +0000
Subject: [PATCH] Build branch main with version main (8da2bf2)

Build pipeline: viash-hub.demultiplex.main-vz4xq

Source commit: https://github.com/viash-hub/demultiplex/commit/8da2bf20c5727df1fcdcc997ae87caf562ac4983

Source message: Bump viash (#35)

* Bump viash to 0.9.1

* Fix config for interop_summary_to_csv

---------

Co-authored-by: DriesSchaumont <5946712+DriesSchaumont@users.noreply.github.com>
---
 _viash.yaml                                   |   2 +-
 src/io/interop_summary_to_csv/config.vsh.yaml |   4 +-
 .../interop_summary_to_csv/.config.vsh.yaml   |  13 +-
 .../interop_summary_to_csv                    |  64 ++-
 target/executable/io/publish/.config.vsh.yaml |  13 +-
 target/executable/io/publish/publish          | 112 +++--
 target/executable/io/untar/.config.vsh.yaml   |  13 +-
 target/executable/io/untar/untar              |  84 ++--
 .../dataflow/combine_samples/.config.vsh.yaml |  13 +-
 .../nextflow/dataflow/combine_samples/main.nf | 384 ++++++++++++++----
 .../.config.vsh.yaml                          |  13 +-
 .../gather_fastqs_and_validate/main.nf        | 384 ++++++++++++++----
 target/nextflow/demultiplex/.config.vsh.yaml  |  13 +-
 target/nextflow/demultiplex/main.nf           | 384 ++++++++++++++----
 .../interop_summary_to_csv/.config.vsh.yaml   |  13 +-
 .../io/interop_summary_to_csv/main.nf         | 384 ++++++++++++++----
 target/nextflow/io/publish/.config.vsh.yaml   |  13 +-
 target/nextflow/io/publish/main.nf            | 384 ++++++++++++++----
 target/nextflow/io/untar/.config.vsh.yaml     |  13 +-
 target/nextflow/io/untar/main.nf              | 384 ++++++++++++++----
 target/nextflow/runner/.config.vsh.yaml       |  13 +-
 target/nextflow/runner/main.nf                | 384 ++++++++++++++----
 22 files changed, 2422 insertions(+), 662 deletions(-)

diff --git a/_viash.yaml b/_viash.yaml
index 5c86251..a038430 100644
--- a/_viash.yaml
+++ b/_viash.yaml
@@ -11,7 +11,7 @@ info:
     - path: gs://viash-hub-test-data/demultiplex/v2/
       dest: testData
 
-viash_version: 0.9.0
+viash_version: 0.9.1
 
 config_mods: |
   .requirements.commands := ['ps']
diff --git a/src/io/interop_summary_to_csv/config.vsh.yaml b/src/io/interop_summary_to_csv/config.vsh.yaml
index 2d74808..853ae89 100644
--- a/src/io/interop_summary_to_csv/config.vsh.yaml
+++ b/src/io/interop_summary_to_csv/config.vsh.yaml
@@ -18,7 +18,7 @@ argument_groups:
         direction: output
         required: true
 requirements:
-  - commands: ["summary", "index-summary"]
+  commands: ["summary", "index-summary"]
 resources:
   - type: bash_script
     path: script.sh
@@ -38,4 +38,4 @@ engines:
 
 runners:
   - type: executable
-  - type: nextflow
\ No newline at end of file
+  - type: nextflow
diff --git a/target/executable/io/interop_summary_to_csv/.config.vsh.yaml b/target/executable/io/interop_summary_to_csv/.config.vsh.yaml
index d969d26..88312dc 100644
--- a/target/executable/io/interop_summary_to_csv/.config.vsh.yaml
+++ b/target/executable/io/interop_summary_to_csv/.config.vsh.yaml
@@ -43,6 +43,9 @@ resources:
   dest: "nextflow_labels.config"
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -145,10 +148,10 @@ build_info:
   engine: "docker|native"
   output: "target/executable/io/interop_summary_to_csv"
   executable: "target/executable/io/interop_summary_to_csv/interop_summary_to_csv"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -157,7 +160,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/executable/io/interop_summary_to_csv/interop_summary_to_csv b/target/executable/io/interop_summary_to_csv/interop_summary_to_csv
index fee31d4..bd7e527 100755
--- a/target/executable/io/interop_summary_to_csv/interop_summary_to_csv
+++ b/target/executable/io/interop_summary_to_csv/interop_summary_to_csv
@@ -2,7 +2,7 @@
 
 # interop_summary_to_csv main
 # 
-# This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+# This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 # work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 # Intuitive.
 # 
@@ -169,22 +169,6 @@ VIASH_META_CONFIG="$VIASH_META_RESOURCES_DIR/.config.vsh.yaml"
 VIASH_META_TEMP_DIR="$VIASH_TEMP"
 
 
-# ViashHelp: Display helpful explanation about this executable
-function ViashHelp {
-  echo "interop_summary_to_csv main"
-  echo ""
-  echo "Input arguments:"
-  echo "    --input"
-  echo "        type: file, required parameter, file must exist"
-  echo "        Sequencing run folder (*not* InterOp folder)."
-  echo ""
-  echo "Output arguments:"
-  echo "    --output_run_summary"
-  echo "        type: file, required parameter, output, file must exist"
-  echo ""
-  echo "    --output_index_summary"
-  echo "        type: file, required parameter, output, file must exist"
-}
 
 # initialise variables
 VIASH_MODE='run'
@@ -470,9 +454,9 @@ tar -C /tmp/ --no-same-owner --no-same-permissions -xvf /tmp/interop.tar.gz && \
 mv /tmp/interop-1.3.1-Linux-GNU/bin/index-summary /tmp/interop-1.3.1-Linux-GNU/bin/summary /usr/local/bin/
 
 LABEL org.opencontainers.image.description="Companion container for running component io interop_summary_to_csv"
-LABEL org.opencontainers.image.created="2024-12-20T11:16:00Z"
+LABEL org.opencontainers.image.created="2025-01-14T11:34:29Z"
 LABEL org.opencontainers.image.source="https://github.com/viash-hub/demultiplex"
-LABEL org.opencontainers.image.revision="d7d3b3e1de64f07a8b161b68a60098103ff691fb"
+LABEL org.opencontainers.image.revision="8da2bf20c5727df1fcdcc997ae87caf562ac4983"
 LABEL org.opencontainers.image.version="main"
 
 VIASHDOCKER
@@ -587,6 +571,48 @@ fi
 # initialise docker variables
 VIASH_DOCKER_RUN_ARGS=(-i --rm)
 
+
+# ViashHelp: Display helpful explanation about this executable
+function ViashHelp {
+  echo "interop_summary_to_csv main"
+  echo ""
+  echo "Input arguments:"
+  echo "    --input"
+  echo "        type: file, required parameter, file must exist"
+  echo "        Sequencing run folder (*not* InterOp folder)."
+  echo ""
+  echo "Output arguments:"
+  echo "    --output_run_summary"
+  echo "        type: file, required parameter, output, file must exist"
+  echo ""
+  echo "    --output_index_summary"
+  echo "        type: file, required parameter, output, file must exist"
+  echo ""
+  echo "Viash built in Computational Requirements:"
+  echo "    ---cpus=INT"
+  echo "        Number of CPUs to use"
+  echo "    ---memory=STRING"
+  echo "        Amount of memory to use. Examples: 4GB, 3MiB."
+  echo ""
+  echo "Viash built in Docker:"
+  echo "    ---setup=STRATEGY"
+  echo "        Setup the docker container. Options are: alwaysbuild, alwayscachedbuild, ifneedbebuild, ifneedbecachedbuild, alwayspull, alwayspullelsebuild, alwayspullelsecachedbuild, ifneedbepull, ifneedbepullelsebuild, ifneedbepullelsecachedbuild, push, pushifnotpresent, donothing."
+  echo "        Default: ifneedbepullelsecachedbuild"
+  echo "    ---dockerfile"
+  echo "        Print the dockerfile to stdout."
+  echo "    ---docker_run_args=ARG"
+  echo "        Provide runtime arguments to Docker. See the documentation on \`docker run\` for more information."
+  echo "    ---docker_image_id"
+  echo "        Print the docker image id to stdout."
+  echo "    ---debug"
+  echo "        Enter the docker container for debugging purposes."
+  echo ""
+  echo "Viash built in Engines:"
+  echo "    ---engine=ENGINE_ID"
+  echo "        Specify the engine to use. Options are: docker, native."
+  echo "        Default: docker"
+}
+
 # initialise array
 VIASH_POSITIONAL_ARGS=''
 
diff --git a/target/executable/io/publish/.config.vsh.yaml b/target/executable/io/publish/.config.vsh.yaml
index 7cb077f..12f274f 100644
--- a/target/executable/io/publish/.config.vsh.yaml
+++ b/target/executable/io/publish/.config.vsh.yaml
@@ -100,6 +100,9 @@ resources:
 description: "Publish the processed results of the run"
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -195,10 +198,10 @@ build_info:
   engine: "docker|native"
   output: "target/executable/io/publish"
   executable: "target/executable/io/publish/publish"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -207,7 +210,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/executable/io/publish/publish b/target/executable/io/publish/publish
index 2f29101..902478e 100755
--- a/target/executable/io/publish/publish
+++ b/target/executable/io/publish/publish
@@ -2,7 +2,7 @@
 
 # publish main
 # 
-# This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+# This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 # work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 # Intuitive.
 # 
@@ -169,46 +169,6 @@ VIASH_META_CONFIG="$VIASH_META_RESOURCES_DIR/.config.vsh.yaml"
 VIASH_META_TEMP_DIR="$VIASH_TEMP"
 
 
-# ViashHelp: Display helpful explanation about this executable
-function ViashHelp {
-  echo "publish main"
-  echo ""
-  echo "Publish the processed results of the run"
-  echo ""
-  echo "Input arguments:"
-  echo "    --input"
-  echo "        type: file, required parameter, file must exist"
-  echo "        Directory to write fastq data to"
-  echo ""
-  echo "    --input_falco"
-  echo "        type: file, required parameter, file must exist"
-  echo "        Directory to write falco output to"
-  echo ""
-  echo "    --input_multiqc"
-  echo "        type: file, required parameter, file must exist"
-  echo "        Location where to write the MultiQC report to."
-  echo ""
-  echo "    --input_run_information"
-  echo "        type: file, required parameter, file must exist"
-  echo "        Location where to write the run information to."
-  echo ""
-  echo "Output arguments:"
-  echo "    --output"
-  echo "        type: file, output, file must exist"
-  echo "        default: fastq"
-  echo ""
-  echo "    --output_falco"
-  echo "        type: file, output, file must exist"
-  echo "        default: qc/fastqc"
-  echo ""
-  echo "    --output_multiqc"
-  echo "        type: file, output, file must exist"
-  echo "        default: qc/multiqc_report.html"
-  echo ""
-  echo "    --output_run_information"
-  echo "        type: file, output, file must exist"
-  echo "        default: run_information.csv"
-}
 
 # initialise variables
 VIASH_MODE='run'
@@ -490,9 +450,9 @@ RUN apt-get update && \
   rm -rf /var/lib/apt/lists/*
 
 LABEL org.opencontainers.image.description="Companion container for running component io publish"
-LABEL org.opencontainers.image.created="2024-12-20T11:16:00Z"
+LABEL org.opencontainers.image.created="2025-01-14T11:34:29Z"
 LABEL org.opencontainers.image.source="https://github.com/viash-hub/demultiplex"
-LABEL org.opencontainers.image.revision="d7d3b3e1de64f07a8b161b68a60098103ff691fb"
+LABEL org.opencontainers.image.revision="8da2bf20c5727df1fcdcc997ae87caf562ac4983"
 LABEL org.opencontainers.image.version="main"
 
 VIASHDOCKER
@@ -607,6 +567,72 @@ fi
 # initialise docker variables
 VIASH_DOCKER_RUN_ARGS=(-i --rm)
 
+
+# ViashHelp: Display helpful explanation about this executable
+function ViashHelp {
+  echo "publish main"
+  echo ""
+  echo "Publish the processed results of the run"
+  echo ""
+  echo "Input arguments:"
+  echo "    --input"
+  echo "        type: file, required parameter, file must exist"
+  echo "        Directory to write fastq data to"
+  echo ""
+  echo "    --input_falco"
+  echo "        type: file, required parameter, file must exist"
+  echo "        Directory to write falco output to"
+  echo ""
+  echo "    --input_multiqc"
+  echo "        type: file, required parameter, file must exist"
+  echo "        Location where to write the MultiQC report to."
+  echo ""
+  echo "    --input_run_information"
+  echo "        type: file, required parameter, file must exist"
+  echo "        Location where to write the run information to."
+  echo ""
+  echo "Output arguments:"
+  echo "    --output"
+  echo "        type: file, output, file must exist"
+  echo "        default: fastq"
+  echo ""
+  echo "    --output_falco"
+  echo "        type: file, output, file must exist"
+  echo "        default: qc/fastqc"
+  echo ""
+  echo "    --output_multiqc"
+  echo "        type: file, output, file must exist"
+  echo "        default: qc/multiqc_report.html"
+  echo ""
+  echo "    --output_run_information"
+  echo "        type: file, output, file must exist"
+  echo "        default: run_information.csv"
+  echo ""
+  echo "Viash built in Computational Requirements:"
+  echo "    ---cpus=INT"
+  echo "        Number of CPUs to use"
+  echo "    ---memory=STRING"
+  echo "        Amount of memory to use. Examples: 4GB, 3MiB."
+  echo ""
+  echo "Viash built in Docker:"
+  echo "    ---setup=STRATEGY"
+  echo "        Setup the docker container. Options are: alwaysbuild, alwayscachedbuild, ifneedbebuild, ifneedbecachedbuild, alwayspull, alwayspullelsebuild, alwayspullelsecachedbuild, ifneedbepull, ifneedbepullelsebuild, ifneedbepullelsecachedbuild, push, pushifnotpresent, donothing."
+  echo "        Default: ifneedbepullelsecachedbuild"
+  echo "    ---dockerfile"
+  echo "        Print the dockerfile to stdout."
+  echo "    ---docker_run_args=ARG"
+  echo "        Provide runtime arguments to Docker. See the documentation on \`docker run\` for more information."
+  echo "    ---docker_image_id"
+  echo "        Print the docker image id to stdout."
+  echo "    ---debug"
+  echo "        Enter the docker container for debugging purposes."
+  echo ""
+  echo "Viash built in Engines:"
+  echo "    ---engine=ENGINE_ID"
+  echo "        Specify the engine to use. Options are: docker, native."
+  echo "        Default: docker"
+}
+
 # initialise array
 VIASH_POSITIONAL_ARGS=''
 
diff --git a/target/executable/io/untar/.config.vsh.yaml b/target/executable/io/untar/.config.vsh.yaml
index 2966c27..0388586 100644
--- a/target/executable/io/untar/.config.vsh.yaml
+++ b/target/executable/io/untar/.config.vsh.yaml
@@ -57,6 +57,9 @@ test_resources:
   is_executable: true
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -152,10 +155,10 @@ build_info:
   engine: "docker|native"
   output: "target/executable/io/untar"
   executable: "target/executable/io/untar/untar"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -164,7 +167,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/executable/io/untar/untar b/target/executable/io/untar/untar
index 982761c..2300f5c 100755
--- a/target/executable/io/untar/untar
+++ b/target/executable/io/untar/untar
@@ -2,7 +2,7 @@
 
 # untar main
 # 
-# This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+# This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 # work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 # Intuitive.
 # 
@@ -169,32 +169,6 @@ VIASH_META_CONFIG="$VIASH_META_RESOURCES_DIR/.config.vsh.yaml"
 VIASH_META_TEMP_DIR="$VIASH_TEMP"
 
 
-# ViashHelp: Display helpful explanation about this executable
-function ViashHelp {
-  echo "untar main"
-  echo ""
-  echo "Unpack a .tar file. When the contents of the .tar file is just a single"
-  echo "directory,"
-  echo "put the contents of the directory into the output folder instead of that"
-  echo "directory."
-  echo ""
-  echo "Input arguments:"
-  echo "    --input"
-  echo "        type: file, required parameter, file must exist"
-  echo "        Tarball file to be unpacked."
-  echo ""
-  echo "Output arguments:"
-  echo "    --output"
-  echo "        type: file, required parameter, output, file must exist"
-  echo "        Directory to write the contents of the .tar file to."
-  echo ""
-  echo "Other arguments:"
-  echo "    -e, --exclude"
-  echo "        type: string"
-  echo "        example: docs/figures"
-  echo "        Prevents any file or member whose name matches the shell wildcard"
-  echo "        (pattern) from being extracted."
-}
 
 # initialise variables
 VIASH_MODE='run'
@@ -476,9 +450,9 @@ RUN apt-get update && \
   rm -rf /var/lib/apt/lists/*
 
 LABEL org.opencontainers.image.description="Companion container for running component io untar"
-LABEL org.opencontainers.image.created="2024-12-20T11:16:01Z"
+LABEL org.opencontainers.image.created="2025-01-14T11:34:29Z"
 LABEL org.opencontainers.image.source="https://github.com/viash-hub/demultiplex"
-LABEL org.opencontainers.image.revision="d7d3b3e1de64f07a8b161b68a60098103ff691fb"
+LABEL org.opencontainers.image.revision="8da2bf20c5727df1fcdcc997ae87caf562ac4983"
 LABEL org.opencontainers.image.version="main"
 
 VIASHDOCKER
@@ -593,6 +567,58 @@ fi
 # initialise docker variables
 VIASH_DOCKER_RUN_ARGS=(-i --rm)
 
+
+# ViashHelp: Display helpful explanation about this executable
+function ViashHelp {
+  echo "untar main"
+  echo ""
+  echo "Unpack a .tar file. When the contents of the .tar file is just a single"
+  echo "directory,"
+  echo "put the contents of the directory into the output folder instead of that"
+  echo "directory."
+  echo ""
+  echo "Input arguments:"
+  echo "    --input"
+  echo "        type: file, required parameter, file must exist"
+  echo "        Tarball file to be unpacked."
+  echo ""
+  echo "Output arguments:"
+  echo "    --output"
+  echo "        type: file, required parameter, output, file must exist"
+  echo "        Directory to write the contents of the .tar file to."
+  echo ""
+  echo "Other arguments:"
+  echo "    -e, --exclude"
+  echo "        type: string"
+  echo "        example: docs/figures"
+  echo "        Prevents any file or member whose name matches the shell wildcard"
+  echo "        (pattern) from being extracted."
+  echo ""
+  echo "Viash built in Computational Requirements:"
+  echo "    ---cpus=INT"
+  echo "        Number of CPUs to use"
+  echo "    ---memory=STRING"
+  echo "        Amount of memory to use. Examples: 4GB, 3MiB."
+  echo ""
+  echo "Viash built in Docker:"
+  echo "    ---setup=STRATEGY"
+  echo "        Setup the docker container. Options are: alwaysbuild, alwayscachedbuild, ifneedbebuild, ifneedbecachedbuild, alwayspull, alwayspullelsebuild, alwayspullelsecachedbuild, ifneedbepull, ifneedbepullelsebuild, ifneedbepullelsecachedbuild, push, pushifnotpresent, donothing."
+  echo "        Default: ifneedbepullelsecachedbuild"
+  echo "    ---dockerfile"
+  echo "        Print the dockerfile to stdout."
+  echo "    ---docker_run_args=ARG"
+  echo "        Provide runtime arguments to Docker. See the documentation on \`docker run\` for more information."
+  echo "    ---docker_image_id"
+  echo "        Print the docker image id to stdout."
+  echo "    ---debug"
+  echo "        Enter the docker container for debugging purposes."
+  echo ""
+  echo "Viash built in Engines:"
+  echo "    ---engine=ENGINE_ID"
+  echo "        Specify the engine to use. Options are: docker, native."
+  echo "        Default: docker"
+}
+
 # initialise array
 VIASH_POSITIONAL_ARGS=''
 
diff --git a/target/nextflow/dataflow/combine_samples/.config.vsh.yaml b/target/nextflow/dataflow/combine_samples/.config.vsh.yaml
index 4b10c53..0d976b4 100644
--- a/target/nextflow/dataflow/combine_samples/.config.vsh.yaml
+++ b/target/nextflow/dataflow/combine_samples/.config.vsh.yaml
@@ -62,6 +62,9 @@ description: "Combine fastq files from across samples into one event with a list
   \ fastq files per orientation."
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -143,10 +146,10 @@ build_info:
   engine: "native|native"
   output: "target/nextflow/dataflow/combine_samples"
   executable: "target/nextflow/dataflow/combine_samples/main.nf"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -155,7 +158,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/nextflow/dataflow/combine_samples/main.nf b/target/nextflow/dataflow/combine_samples/main.nf
index d00f99e..4c9ce40 100644
--- a/target/nextflow/dataflow/combine_samples/main.nf
+++ b/target/nextflow/dataflow/combine_samples/main.nf
@@ -1,6 +1,6 @@
 // combine_samples main
 // 
-// This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+// This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 // work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 // Intuitive.
 // 
@@ -173,7 +173,7 @@ def _checkArgumentType(String stage, Map par, Object value, String errorIdentifi
 Map _processInputValues(Map inputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
     config.allArguments.each { arg ->
-      if (arg.required) {
+      if (arg.required && arg.direction == "input") {
         assert inputs.containsKey(arg.plainName) && inputs.get(arg.plainName) != null : 
           "Error in module '${key}' id '${id}': required input argument '${arg.plainName}' is missing"
       }
@@ -192,15 +192,8 @@ Map _processInputValues(Map inputs, Map config, String id, String key) {
 }
 
 // helper file: 'src/main/resources/io/viash/runners/nextflow/arguments/_processOutputValues.nf'
-Map _processOutputValues(Map outputs, Map config, String id, String key) {
+Map _checkValidOutputArgument(Map outputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
-    config.allArguments.each { arg ->
-      if (arg.direction == "output" && arg.required) {
-        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
-          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
-      }
-    }
-
     outputs = outputs.collectEntries { name, value ->
       def par = config.allArguments.find { it.plainName == name && it.direction == "output" }
       assert par != null : "Error in module '${key}' id '${id}': '${name}' is not a valid output argument"
@@ -213,6 +206,16 @@ Map _processOutputValues(Map outputs, Map config, String id, String key) {
   return outputs
 }
 
+void _checkAllRequiredOuputsPresent(Map outputs, Map config, String id, String key) {
+  if (!workflow.stubRun) {
+    config.allArguments.each { arg ->
+      if (arg.direction == "output" && arg.required) {
+        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
+          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
+      }
+    }
+  }
+}
 // helper file: 'src/main/resources/io/viash/runners/nextflow/channel/IDChecker.nf'
 class IDChecker {
   final def items = [] as Set
@@ -1666,6 +1669,162 @@ def joinStates(Closure apply_) {
   }
   return joinStatesWf
 }
+// helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishFiles.nf'
+def publishFiles(Map args) {
+  def key_ = args.get("key")
+
+  assert key_ != null : "publishFiles: key must be specified"
+  
+  workflow publishFilesWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1]
+
+          // the input files and the target output filenames
+          def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
+          def inputFiles_ = inputoutputFilenames_[0]
+          def outputFilenames_ = inputoutputFilenames_[1]
+
+          [id_, inputFiles_, outputFilenames_]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesWf
+}
+
+process publishFilesProc {
+  // todo: check publishpath?
+  publishDir path: "${getPublishDir()}/", mode: "copy"
+  tag "$id"
+  input:
+    tuple val(id), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+  output:
+    tuple val(id), path{outputFiles}
+  script:
+  def copyCommands = [
+    inputFiles instanceof List ? inputFiles : [inputFiles],
+    outputFiles instanceof List ? outputFiles : [outputFiles]
+  ]
+    .transpose()
+    .collectMany{infile, outfile ->
+      if (infile.toString() != outfile.toString()) {
+        [
+          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
+          "cp -r '${infile.toString()}' '${outfile.toString()}'"
+        ]
+      } else {
+        // no need to copy if infile is the same as outfile
+        []
+      }
+    }
+  """
+  echo "Copying output files to destination folder"
+  ${copyCommands.join("\n  ")}
+  """
+}
+
+
+// this assumes that the state contains no other values other than those specified in the config
+def publishFilesByConfig(Map args) {
+  def config = args.get("config")
+  assert config != null : "publishFilesByConfig: config must be specified"
+
+  def key_ = args.get("key", config.name)
+  assert key_ != null : "publishFilesByConfig: key must be specified"
+  
+  workflow publishFilesSimpleWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1] // e.g. [output: new File("myoutput.h5ad"), k: 10]
+          def origState_ = tup[2] // e.g. [output: '$id.$key.foo.h5ad']
+
+
+          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          //   - key is a String
+          //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
+          //   - inputPath is a List[Path]
+          //   - outputFilename is a List[String]
+          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
+          def processedState =
+            config.allArguments
+              .findAll { it.direction == "output" }
+              .collectMany { par ->
+                def plainName_ = par.plainName
+                // if the state does not contain the key, it's an
+                // optional argument for which the component did 
+                // not generate any output OR multiple channels were emitted
+                // and the output was just not added to using the channel
+                // that is now being parsed
+                if (!state_.containsKey(plainName_)) {
+                  return []
+                }
+                def value = state_[plainName_]
+                // if the parameter is not a file, it should be stored
+                // in the state as-is, but is not something that needs 
+                // to be copied from the source path to the dest path
+                if (par.type != "file") {
+                  return [[inputPath: [], outputFilename: []]]
+                }
+                // if the orig state does not contain this filename,
+                // it's an optional argument for which the user specified
+                // that it should not be returned as a state
+                if (!origState_.containsKey(plainName_)) {
+                  return []
+                }
+                def filenameTemplate = origState_[plainName_]
+                // if the pararameter is multiple: true, fetch the template
+                if (par.multiple && filenameTemplate instanceof List) {
+                  filenameTemplate = filenameTemplate[0]
+                }
+                // instantiate the template
+                def filename = filenameTemplate
+                  .replaceAll('\\$id', id_)
+                  .replaceAll('\\$\\{id\\}', id_)
+                  .replaceAll('\\$key', key_)
+                  .replaceAll('\\$\\{key\\}', key_)
+                if (par.multiple) {
+                  // if the parameter is multiple: true, the filename
+                  // should contain a wildcard '*' that is replaced with
+                  // the index of the file
+                  assert filename.contains("*") : "Module '${key_}' id '${id_}': Multiple output files specified, but no wildcard '*' in the filename: ${filename}"
+                  def outputPerFile = value.withIndex().collect{ val, ix ->
+                    def filename_ix = filename.replace("*", ix.toString())
+                    def inputPath = val instanceof File ? val.toPath() : val
+                    [inputPath: inputPath, outputFilename: filename_ix]
+                  }
+                  def transposedOutputs = ["inputPath", "outputFilename"].collectEntries{ key -> 
+                    [key, outputPerFile.collect{dic -> dic[key]}]
+                  }
+                  return [[key: plainName_] + transposedOutputs]
+                } else {
+                  def value_ = java.nio.file.Paths.get(filename)
+                  def inputPath = value instanceof File ? value.toPath() : value
+                  return [[inputPath: [inputPath], outputFilename: [filename]]]
+                }
+              }
+          
+          def inputPaths = processedState.collectMany{it.inputPath}
+          def outputFilenames = processedState.collectMany{it.outputFilename}
+          
+
+          [id_, inputPaths, outputFilenames]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesSimpleWf
+}
+
+
+
+
 // helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishStates.nf'
 def collectFiles(obj) {
   if (obj instanceof java.io.File || obj instanceof Path)  {
@@ -1723,8 +1882,6 @@ def publishStates(Map args) {
 
           // the input files and the target output filenames
           def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
-          def inputFiles_ = inputoutputFilenames_[0]
-          def outputFilenames_ = inputoutputFilenames_[1]
 
           def yamlFilename = yamlTemplate_
             .replaceAll('\\$id', id_)
@@ -1737,7 +1894,7 @@ def publishStates(Map args) {
           // convert state to yaml blob
           def yamlBlob_ = toRelativeTaggedYamlBlob([id: id_] + state_, java.nio.file.Paths.get(yamlFilename))
 
-          [id_, yamlBlob_, yamlFilename, inputFiles_, outputFilenames_]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -1749,33 +1906,17 @@ process publishStatesProc {
   publishDir path: "${getPublishDir()}/", mode: "copy"
   tag "$id"
   input:
-    tuple val(id), val(yamlBlob), val(yamlFile), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+    tuple val(id), val(yamlBlob), val(yamlFile)
   output:
-    tuple val(id), path{[yamlFile] + outputFiles}
+    tuple val(id), path{[yamlFile]}
   script:
-  def copyCommands = [
-    inputFiles instanceof List ? inputFiles : [inputFiles],
-    outputFiles instanceof List ? outputFiles : [outputFiles]
-  ]
-    .transpose()
-    .collectMany{infile, outfile ->
-      if (infile.toString() != outfile.toString()) {
-        [
-          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
-          "cp -r '${infile.toString()}' '${outfile.toString()}'"
-        ]
-      } else {
-        // no need to copy if infile is the same as outfile
-        []
-      }
-    }
   """
-mkdir -p "\$(dirname '${yamlFile}')"
-echo "Storing state as yaml"
-echo '${yamlBlob}' > '${yamlFile}'
-echo "Copying output files to destination folder"
-${copyCommands.join("\n  ")}
-"""
+  mkdir -p "\$(dirname '${yamlFile}')"
+  echo "Storing state as yaml"
+  cat > '${yamlFile}' << HERE
+${yamlBlob}
+HERE
+  """
 }
 
 
@@ -1806,13 +1947,10 @@ def publishStatesByConfig(Map args) {
             .replaceAll('\\$\\{key\\}', key_)
           def yamlDir = java.nio.file.Paths.get(yamlFilename).getParent()
 
-          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          // the processed state is a list of [key, value] tuples, where
           //   - key is a String
           //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
-          //   - inputPath is a List[Path]
-          //   - outputFilename is a List[String]
           //   - (key, value) are the tuples that will be saved to the state.yaml file
-          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
           def processedState =
             config.allArguments
               .findAll { it.direction == "output" }
@@ -1829,7 +1967,7 @@ def publishStatesByConfig(Map args) {
                 // in the state as-is, but is not something that needs 
                 // to be copied from the source path to the dest path
                 if (par.type != "file") {
-                  return [[key: plainName_, value: value, inputPath: [], outputFilename: []]]
+                  return [[key: plainName_, value: value]]
                 }
                 // if the orig state does not contain this filename,
                 // it's an optional argument for which the user specified
@@ -1860,13 +1998,9 @@ def publishStatesByConfig(Map args) {
                     if (yamlDir != null) {
                       value_ = yamlDir.relativize(value_)
                     }
-                    def inputPath = val instanceof File ? val.toPath() : val
-                    [value: value_, inputPath: inputPath, outputFilename: filename_ix]
+                    return value_
                   }
-                  def transposedOutputs = ["value", "inputPath", "outputFilename"].collectEntries{ key -> 
-                    [key, outputPerFile.collect{dic -> dic[key]}]
-                  }
-                  return [[key: plainName_] + transposedOutputs]
+                  return [["key": plainName_, "value": outputPerFile]]
                 } else {
                   def value_ = java.nio.file.Paths.get(filename)
                   // if id contains a slash
@@ -1874,18 +2008,17 @@ def publishStatesByConfig(Map args) {
                     value_ = yamlDir.relativize(value_)
                   }
                   def inputPath = value instanceof File ? value.toPath() : value
-                  return [[key: plainName_, value: value_, inputPath: [inputPath], outputFilename: [filename]]]
+                  return [["key": plainName_, value: value_]]
                 }
               }
+              
           
           def updatedState_ = processedState.collectEntries{[it.key, it.value]}
-          def inputPaths = processedState.collectMany{it.inputPath}
-          def outputFilenames = processedState.collectMany{it.outputFilename}
           
           // convert state to yaml blob
           def yamlBlob_ = toTaggedYamlBlob([id: id_] + updatedState_)
 
-          [id_, yamlBlob_, yamlFilename, inputPaths, outputFilenames]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -2559,7 +2692,8 @@ def _debug(workflowArgs, debugKey) {
 def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
   def workflowArgs = processWorkflowArgs(args, defaultWfArgs, meta)
   def key_ = workflowArgs["key"]
-  
+  def multipleArgs = meta.config.allArguments.findAll{ it.multiple }.collect{it.plainName}
+
   workflow workflowInstance {
     take: input_
 
@@ -2716,12 +2850,36 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     // TODO: move some of the _meta.join_id wrangling to the safeJoin() function.
-    def chInitialOutput = chArgsWithDefaults
+    def chInitialOutputMulti = chArgsWithDefaults
       | _debug(workflowArgs, "processed")
       // run workflow
       | innerWorkflowFactory(workflowArgs)
-      // check output tuple
-      | map { id_, output_ ->
+    def chInitialOutputList = chInitialOutputMulti instanceof List ? chInitialOutputMulti : [chInitialOutputMulti]
+    assert chInitialOutputList.size() > 0: "should have emitted at least one output channel"
+    // Add a channel ID to the events, which designates the channel the event was emitted from as a running number
+    // This number is used to sort the events later when the events are gathered from across the channels.
+    def chInitialOutputListWithIndexedEvents = chInitialOutputList.withIndex().collect{channel, channelIndex ->
+      def newChannel = channel
+        | map {tuple ->
+          assert tuple instanceof List : 
+          "Error in module '${key_}': element in output channel should be a tuple [id, data, ...otherargs...]\n" +
+          "  Example: [\"id\", [input: file('foo.txt'), arg: 10]].\n" +
+          "  Expected class: List. Found: tuple.getClass() is ${tuple.getClass()}"
+        
+          def newEvent = [channelIndex] + tuple
+          return newEvent
+        }
+      return newChannel
+    }
+    // Put the events into 1 channel, cover case where there is only one channel is emitted
+    def chInitialOutput = chInitialOutputList.size() > 1 ? \
+      chInitialOutputListWithIndexedEvents[0].mix(*chInitialOutputListWithIndexedEvents.tail()) : \
+      chInitialOutputListWithIndexedEvents[0]
+    def chInitialOutputProcessed = chInitialOutput
+      | map { tuple  ->
+        def channelId = tuple[0]
+        def id_ = tuple[1]
+        def output_ = tuple[2]
 
         // see if output map contains metadata
         def meta_ =
@@ -2734,19 +2892,95 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
         output_ = output_.findAll{k, v -> k != "_meta"}
 
         // check value types
-        output_ = _processOutputValues(output_, meta.config, id_, key_)
+        output_ = _checkValidOutputArgument(output_, meta.config, id_, key_)
 
-        // simplify output if need be
-        if (workflowArgs.auto.simplifyOutput && output_.size() == 1) {
-          output_ = output_.values()[0]
-        }
-
-        [join_id, id_, output_]
+        [join_id, channelId, id_, output_]
       }
       // | view{"chInitialOutput: ${it.take(3)}"}
 
+    // join the output [prev_id, channel_id, new_id, output] with the previous state [prev_id, state, ...]
+    def chPublishWithPreviousState = safeJoin(chInitialOutputProcessed, chRunFiltered, key_)
+      // input tuple format: [join_id, channel_id, id, output, prev_state, ...]
+      // output tuple format: [join_id, channel_id, id, new_state, ...]
+      | map{ tup ->
+        def new_state = workflowArgs.toState(tup.drop(2).take(3))
+        tup.take(3) + [new_state] + tup.drop(5)
+      }
+    if (workflowArgs.auto.publish == "state") {
+      def chPublishFiles = chPublishWithPreviousState
+        // input tuple format: [join_id, channel_id, id, new_state, ...]
+        // output tuple format: [join_id, channel_id, id, new_state]
+        | map{ tup ->
+          tup.take(4)
+        }
+
+      safeJoin(chPublishFiles, chArgsWithDefaults, key_)
+        // input tuple format: [join_id, channel_id, id, new_state, orig_state, ...]
+        // output tuple format: [id, new_state, orig_state]
+        | map { tup ->
+          tup.drop(2).take(3)
+        }
+        | publishFilesByConfig(key: key_, config: meta.config)
+    }
+    // Join the state from the events that were emitted from different channels
+    def chJoined = chInitialOutputProcessed
+      | map {tuple ->
+        def join_id = tuple[0]
+        def channel_id = tuple[1]
+        def id = tuple[2]
+        def other = tuple.drop(3)
+        // Below, groupTuple is used to join the events. To make sure resuming a workflow
+        // keeps working, the output state must be deterministic. This means the state needs to be
+        // sorted with groupTuple's has a 'sort' argument. This argument can be set to 'hash',
+        // but hashing the state when it is large can be problematic in terms of performance.
+        // Therefore, a custom comparator function is provided. We add the channel ID to the 
+        // states so that we can use the channel ID to sort the items. 
+        def stateWithChannelID = [[channel_id] * other.size(), other].transpose()
+        // A comparator that is provided to groupTuple's 'sort' argument is applied
+        // to all elements of the event tuple (that is not the 'id'). The comparator
+        // closure that is used below expects the input to be List. So the join_id and
+        // channel_id must also be wrapped in a list. 
+        [[join_id], [channel_id], id] + stateWithChannelID
+      }
+      | groupTuple(by: 2, sort: {a, b -> a[0] <=> b[0]}, size: chInitialOutputList.size(), remainder: true)
+      | map {join_ids, _, id, statesWithChannelID ->
+        // Remove the channel IDs from the states
+        def states = statesWithChannelID.collect{it[1]}
+        def newJoinId = join_ids.flatten().unique{a, b -> a <=> b}
+        assert newJoinId.size() == 1: "Multiple events were emitted for '$id'."
+        def newJoinIdUnique = newJoinId[0]
+        def newState = states.inject([:]){ old_state, state_to_add ->
+          def stateToAddNoMultiple = state_to_add.findAll{k, v -> !multipleArgs.contains(k)}
+          // First add non multiple arguments
+
+          def overlap = old_state.keySet().intersect(stateToAddNoMultiple.keySet())
+          assert overlap.isEmpty() : "ID $id: multiple entries for " + 
+            " argument(s) $overlap were emitted."
+          def return_state = old_state + stateToAddNoMultiple
+
+          // Add `multiple: true` arguments
+          def stateToAddMultiple = state_to_add.findAll{k, v -> multipleArgs.contains(k)}
+          stateToAddMultiple.each {k, v ->
+            def currentKey = return_state.getOrDefault(k, [])
+            def currentKeyList = currentKey instanceof List ? currentKey : [currentKey]
+            currentKeyList.add(v)
+            return_state[k] = currentKeyList
+          }
+          return return_state
+        }
+
+        _checkAllRequiredOuputsPresent(newState, meta.config, id, key_)
+
+        // simplify output if need be
+        if (workflowArgs.auto.simplifyOutput && newState.size() == 1) {
+          newState = newState.values()[0]
+        }
+
+        return [newJoinIdUnique, id, newState]
+      }
+    
     // join the output [prev_id, new_id, output] with the previous state [prev_id, state, ...]
-    def chNewState = safeJoin(chInitialOutput, chRunFiltered, key_)
+    def chNewState = safeJoin(chJoined, chRunFiltered, key_)
       // input tuple format: [join_id, id, output, prev_state, ...]
       // output tuple format: [join_id, id, new_state, ...]
       | map{ tup ->
@@ -2755,23 +2989,21 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     if (workflowArgs.auto.publish == "state") {
-      def chPublish = chNewState
+      def chPublishStates = chNewState
         // input tuple format: [join_id, id, new_state, ...]
         // output tuple format: [join_id, id, new_state]
         | map{ tup ->
           tup.take(3)
         }
 
-      safeJoin(chPublish, chArgsWithDefaults, key_)
+      safeJoin(chPublishStates, chArgsWithDefaults, key_)
         // input tuple format: [join_id, id, new_state, orig_state, ...]
         // output tuple format: [id, new_state, orig_state]
         | map { tup ->
           tup.drop(1).take(3)
-      }
+        }
         | publishStatesByConfig(key: key_, config: meta.config)
     }
-
-    // remove join_id and meta
     chReturn = chNewState
       | map { tup ->
         // input tuple format: [join_id, id, new_state, ...]
@@ -2883,6 +3115,10 @@ meta = [
   ],
   "description" : "Combine fastq files from across samples into one event with a list of fastq files per orientation.",
   "status" : "enabled",
+  "scope" : {
+    "image" : "public",
+    "target" : "public"
+  },
   "requirements" : {
     "commands" : [
       "ps"
@@ -2979,10 +3215,10 @@ meta = [
     "runner" : "nextflow",
     "engine" : "native|native",
     "output" : "target/nextflow/dataflow/combine_samples",
-    "viash_version" : "0.9.0",
-    "git_commit" : "d7d3b3e1de64f07a8b161b68a60098103ff691fb",
-    "git_remote" : "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex",
-    "git_tag" : "v0.1.1-14-gd7d3b3e"
+    "viash_version" : "0.9.1",
+    "git_commit" : "8da2bf20c5727df1fcdcc997ae87caf562ac4983",
+    "git_remote" : "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex",
+    "git_tag" : "v0.1.1-15-g8da2bf2"
   },
   "package_config" : {
     "name" : "demultiplex",
@@ -2996,7 +3232,7 @@ meta = [
         }
       ]
     },
-    "viash_version" : "0.9.0",
+    "viash_version" : "0.9.1",
     "source" : "src",
     "target" : "target",
     "config_mods" : [
diff --git a/target/nextflow/dataflow/gather_fastqs_and_validate/.config.vsh.yaml b/target/nextflow/dataflow/gather_fastqs_and_validate/.config.vsh.yaml
index fed6231..7f63365 100644
--- a/target/nextflow/dataflow/gather_fastqs_and_validate/.config.vsh.yaml
+++ b/target/nextflow/dataflow/gather_fastqs_and_validate/.config.vsh.yaml
@@ -56,6 +56,9 @@ description: "From a directory containing fastq files, gather the files per samp
   \ \nand validate according to the contents of the sample sheet.\n"
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -137,10 +140,10 @@ build_info:
   engine: "native|native"
   output: "target/nextflow/dataflow/gather_fastqs_and_validate"
   executable: "target/nextflow/dataflow/gather_fastqs_and_validate/main.nf"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -149,7 +152,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/nextflow/dataflow/gather_fastqs_and_validate/main.nf b/target/nextflow/dataflow/gather_fastqs_and_validate/main.nf
index 993c13c..dda64bf 100644
--- a/target/nextflow/dataflow/gather_fastqs_and_validate/main.nf
+++ b/target/nextflow/dataflow/gather_fastqs_and_validate/main.nf
@@ -1,6 +1,6 @@
 // gather_fastqs_and_validate main
 // 
-// This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+// This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 // work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 // Intuitive.
 // 
@@ -173,7 +173,7 @@ def _checkArgumentType(String stage, Map par, Object value, String errorIdentifi
 Map _processInputValues(Map inputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
     config.allArguments.each { arg ->
-      if (arg.required) {
+      if (arg.required && arg.direction == "input") {
         assert inputs.containsKey(arg.plainName) && inputs.get(arg.plainName) != null : 
           "Error in module '${key}' id '${id}': required input argument '${arg.plainName}' is missing"
       }
@@ -192,15 +192,8 @@ Map _processInputValues(Map inputs, Map config, String id, String key) {
 }
 
 // helper file: 'src/main/resources/io/viash/runners/nextflow/arguments/_processOutputValues.nf'
-Map _processOutputValues(Map outputs, Map config, String id, String key) {
+Map _checkValidOutputArgument(Map outputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
-    config.allArguments.each { arg ->
-      if (arg.direction == "output" && arg.required) {
-        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
-          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
-      }
-    }
-
     outputs = outputs.collectEntries { name, value ->
       def par = config.allArguments.find { it.plainName == name && it.direction == "output" }
       assert par != null : "Error in module '${key}' id '${id}': '${name}' is not a valid output argument"
@@ -213,6 +206,16 @@ Map _processOutputValues(Map outputs, Map config, String id, String key) {
   return outputs
 }
 
+void _checkAllRequiredOuputsPresent(Map outputs, Map config, String id, String key) {
+  if (!workflow.stubRun) {
+    config.allArguments.each { arg ->
+      if (arg.direction == "output" && arg.required) {
+        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
+          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
+      }
+    }
+  }
+}
 // helper file: 'src/main/resources/io/viash/runners/nextflow/channel/IDChecker.nf'
 class IDChecker {
   final def items = [] as Set
@@ -1666,6 +1669,162 @@ def joinStates(Closure apply_) {
   }
   return joinStatesWf
 }
+// helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishFiles.nf'
+def publishFiles(Map args) {
+  def key_ = args.get("key")
+
+  assert key_ != null : "publishFiles: key must be specified"
+  
+  workflow publishFilesWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1]
+
+          // the input files and the target output filenames
+          def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
+          def inputFiles_ = inputoutputFilenames_[0]
+          def outputFilenames_ = inputoutputFilenames_[1]
+
+          [id_, inputFiles_, outputFilenames_]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesWf
+}
+
+process publishFilesProc {
+  // todo: check publishpath?
+  publishDir path: "${getPublishDir()}/", mode: "copy"
+  tag "$id"
+  input:
+    tuple val(id), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+  output:
+    tuple val(id), path{outputFiles}
+  script:
+  def copyCommands = [
+    inputFiles instanceof List ? inputFiles : [inputFiles],
+    outputFiles instanceof List ? outputFiles : [outputFiles]
+  ]
+    .transpose()
+    .collectMany{infile, outfile ->
+      if (infile.toString() != outfile.toString()) {
+        [
+          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
+          "cp -r '${infile.toString()}' '${outfile.toString()}'"
+        ]
+      } else {
+        // no need to copy if infile is the same as outfile
+        []
+      }
+    }
+  """
+  echo "Copying output files to destination folder"
+  ${copyCommands.join("\n  ")}
+  """
+}
+
+
+// this assumes that the state contains no other values other than those specified in the config
+def publishFilesByConfig(Map args) {
+  def config = args.get("config")
+  assert config != null : "publishFilesByConfig: config must be specified"
+
+  def key_ = args.get("key", config.name)
+  assert key_ != null : "publishFilesByConfig: key must be specified"
+  
+  workflow publishFilesSimpleWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1] // e.g. [output: new File("myoutput.h5ad"), k: 10]
+          def origState_ = tup[2] // e.g. [output: '$id.$key.foo.h5ad']
+
+
+          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          //   - key is a String
+          //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
+          //   - inputPath is a List[Path]
+          //   - outputFilename is a List[String]
+          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
+          def processedState =
+            config.allArguments
+              .findAll { it.direction == "output" }
+              .collectMany { par ->
+                def plainName_ = par.plainName
+                // if the state does not contain the key, it's an
+                // optional argument for which the component did 
+                // not generate any output OR multiple channels were emitted
+                // and the output was just not added to using the channel
+                // that is now being parsed
+                if (!state_.containsKey(plainName_)) {
+                  return []
+                }
+                def value = state_[plainName_]
+                // if the parameter is not a file, it should be stored
+                // in the state as-is, but is not something that needs 
+                // to be copied from the source path to the dest path
+                if (par.type != "file") {
+                  return [[inputPath: [], outputFilename: []]]
+                }
+                // if the orig state does not contain this filename,
+                // it's an optional argument for which the user specified
+                // that it should not be returned as a state
+                if (!origState_.containsKey(plainName_)) {
+                  return []
+                }
+                def filenameTemplate = origState_[plainName_]
+                // if the pararameter is multiple: true, fetch the template
+                if (par.multiple && filenameTemplate instanceof List) {
+                  filenameTemplate = filenameTemplate[0]
+                }
+                // instantiate the template
+                def filename = filenameTemplate
+                  .replaceAll('\\$id', id_)
+                  .replaceAll('\\$\\{id\\}', id_)
+                  .replaceAll('\\$key', key_)
+                  .replaceAll('\\$\\{key\\}', key_)
+                if (par.multiple) {
+                  // if the parameter is multiple: true, the filename
+                  // should contain a wildcard '*' that is replaced with
+                  // the index of the file
+                  assert filename.contains("*") : "Module '${key_}' id '${id_}': Multiple output files specified, but no wildcard '*' in the filename: ${filename}"
+                  def outputPerFile = value.withIndex().collect{ val, ix ->
+                    def filename_ix = filename.replace("*", ix.toString())
+                    def inputPath = val instanceof File ? val.toPath() : val
+                    [inputPath: inputPath, outputFilename: filename_ix]
+                  }
+                  def transposedOutputs = ["inputPath", "outputFilename"].collectEntries{ key -> 
+                    [key, outputPerFile.collect{dic -> dic[key]}]
+                  }
+                  return [[key: plainName_] + transposedOutputs]
+                } else {
+                  def value_ = java.nio.file.Paths.get(filename)
+                  def inputPath = value instanceof File ? value.toPath() : value
+                  return [[inputPath: [inputPath], outputFilename: [filename]]]
+                }
+              }
+          
+          def inputPaths = processedState.collectMany{it.inputPath}
+          def outputFilenames = processedState.collectMany{it.outputFilename}
+          
+
+          [id_, inputPaths, outputFilenames]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesSimpleWf
+}
+
+
+
+
 // helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishStates.nf'
 def collectFiles(obj) {
   if (obj instanceof java.io.File || obj instanceof Path)  {
@@ -1723,8 +1882,6 @@ def publishStates(Map args) {
 
           // the input files and the target output filenames
           def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
-          def inputFiles_ = inputoutputFilenames_[0]
-          def outputFilenames_ = inputoutputFilenames_[1]
 
           def yamlFilename = yamlTemplate_
             .replaceAll('\\$id', id_)
@@ -1737,7 +1894,7 @@ def publishStates(Map args) {
           // convert state to yaml blob
           def yamlBlob_ = toRelativeTaggedYamlBlob([id: id_] + state_, java.nio.file.Paths.get(yamlFilename))
 
-          [id_, yamlBlob_, yamlFilename, inputFiles_, outputFilenames_]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -1749,33 +1906,17 @@ process publishStatesProc {
   publishDir path: "${getPublishDir()}/", mode: "copy"
   tag "$id"
   input:
-    tuple val(id), val(yamlBlob), val(yamlFile), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+    tuple val(id), val(yamlBlob), val(yamlFile)
   output:
-    tuple val(id), path{[yamlFile] + outputFiles}
+    tuple val(id), path{[yamlFile]}
   script:
-  def copyCommands = [
-    inputFiles instanceof List ? inputFiles : [inputFiles],
-    outputFiles instanceof List ? outputFiles : [outputFiles]
-  ]
-    .transpose()
-    .collectMany{infile, outfile ->
-      if (infile.toString() != outfile.toString()) {
-        [
-          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
-          "cp -r '${infile.toString()}' '${outfile.toString()}'"
-        ]
-      } else {
-        // no need to copy if infile is the same as outfile
-        []
-      }
-    }
   """
-mkdir -p "\$(dirname '${yamlFile}')"
-echo "Storing state as yaml"
-echo '${yamlBlob}' > '${yamlFile}'
-echo "Copying output files to destination folder"
-${copyCommands.join("\n  ")}
-"""
+  mkdir -p "\$(dirname '${yamlFile}')"
+  echo "Storing state as yaml"
+  cat > '${yamlFile}' << HERE
+${yamlBlob}
+HERE
+  """
 }
 
 
@@ -1806,13 +1947,10 @@ def publishStatesByConfig(Map args) {
             .replaceAll('\\$\\{key\\}', key_)
           def yamlDir = java.nio.file.Paths.get(yamlFilename).getParent()
 
-          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          // the processed state is a list of [key, value] tuples, where
           //   - key is a String
           //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
-          //   - inputPath is a List[Path]
-          //   - outputFilename is a List[String]
           //   - (key, value) are the tuples that will be saved to the state.yaml file
-          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
           def processedState =
             config.allArguments
               .findAll { it.direction == "output" }
@@ -1829,7 +1967,7 @@ def publishStatesByConfig(Map args) {
                 // in the state as-is, but is not something that needs 
                 // to be copied from the source path to the dest path
                 if (par.type != "file") {
-                  return [[key: plainName_, value: value, inputPath: [], outputFilename: []]]
+                  return [[key: plainName_, value: value]]
                 }
                 // if the orig state does not contain this filename,
                 // it's an optional argument for which the user specified
@@ -1860,13 +1998,9 @@ def publishStatesByConfig(Map args) {
                     if (yamlDir != null) {
                       value_ = yamlDir.relativize(value_)
                     }
-                    def inputPath = val instanceof File ? val.toPath() : val
-                    [value: value_, inputPath: inputPath, outputFilename: filename_ix]
+                    return value_
                   }
-                  def transposedOutputs = ["value", "inputPath", "outputFilename"].collectEntries{ key -> 
-                    [key, outputPerFile.collect{dic -> dic[key]}]
-                  }
-                  return [[key: plainName_] + transposedOutputs]
+                  return [["key": plainName_, "value": outputPerFile]]
                 } else {
                   def value_ = java.nio.file.Paths.get(filename)
                   // if id contains a slash
@@ -1874,18 +2008,17 @@ def publishStatesByConfig(Map args) {
                     value_ = yamlDir.relativize(value_)
                   }
                   def inputPath = value instanceof File ? value.toPath() : value
-                  return [[key: plainName_, value: value_, inputPath: [inputPath], outputFilename: [filename]]]
+                  return [["key": plainName_, value: value_]]
                 }
               }
+              
           
           def updatedState_ = processedState.collectEntries{[it.key, it.value]}
-          def inputPaths = processedState.collectMany{it.inputPath}
-          def outputFilenames = processedState.collectMany{it.outputFilename}
           
           // convert state to yaml blob
           def yamlBlob_ = toTaggedYamlBlob([id: id_] + updatedState_)
 
-          [id_, yamlBlob_, yamlFilename, inputPaths, outputFilenames]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -2559,7 +2692,8 @@ def _debug(workflowArgs, debugKey) {
 def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
   def workflowArgs = processWorkflowArgs(args, defaultWfArgs, meta)
   def key_ = workflowArgs["key"]
-  
+  def multipleArgs = meta.config.allArguments.findAll{ it.multiple }.collect{it.plainName}
+
   workflow workflowInstance {
     take: input_
 
@@ -2716,12 +2850,36 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     // TODO: move some of the _meta.join_id wrangling to the safeJoin() function.
-    def chInitialOutput = chArgsWithDefaults
+    def chInitialOutputMulti = chArgsWithDefaults
       | _debug(workflowArgs, "processed")
       // run workflow
       | innerWorkflowFactory(workflowArgs)
-      // check output tuple
-      | map { id_, output_ ->
+    def chInitialOutputList = chInitialOutputMulti instanceof List ? chInitialOutputMulti : [chInitialOutputMulti]
+    assert chInitialOutputList.size() > 0: "should have emitted at least one output channel"
+    // Add a channel ID to the events, which designates the channel the event was emitted from as a running number
+    // This number is used to sort the events later when the events are gathered from across the channels.
+    def chInitialOutputListWithIndexedEvents = chInitialOutputList.withIndex().collect{channel, channelIndex ->
+      def newChannel = channel
+        | map {tuple ->
+          assert tuple instanceof List : 
+          "Error in module '${key_}': element in output channel should be a tuple [id, data, ...otherargs...]\n" +
+          "  Example: [\"id\", [input: file('foo.txt'), arg: 10]].\n" +
+          "  Expected class: List. Found: tuple.getClass() is ${tuple.getClass()}"
+        
+          def newEvent = [channelIndex] + tuple
+          return newEvent
+        }
+      return newChannel
+    }
+    // Put the events into 1 channel, cover case where there is only one channel is emitted
+    def chInitialOutput = chInitialOutputList.size() > 1 ? \
+      chInitialOutputListWithIndexedEvents[0].mix(*chInitialOutputListWithIndexedEvents.tail()) : \
+      chInitialOutputListWithIndexedEvents[0]
+    def chInitialOutputProcessed = chInitialOutput
+      | map { tuple  ->
+        def channelId = tuple[0]
+        def id_ = tuple[1]
+        def output_ = tuple[2]
 
         // see if output map contains metadata
         def meta_ =
@@ -2734,19 +2892,95 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
         output_ = output_.findAll{k, v -> k != "_meta"}
 
         // check value types
-        output_ = _processOutputValues(output_, meta.config, id_, key_)
+        output_ = _checkValidOutputArgument(output_, meta.config, id_, key_)
 
-        // simplify output if need be
-        if (workflowArgs.auto.simplifyOutput && output_.size() == 1) {
-          output_ = output_.values()[0]
-        }
-
-        [join_id, id_, output_]
+        [join_id, channelId, id_, output_]
       }
       // | view{"chInitialOutput: ${it.take(3)}"}
 
+    // join the output [prev_id, channel_id, new_id, output] with the previous state [prev_id, state, ...]
+    def chPublishWithPreviousState = safeJoin(chInitialOutputProcessed, chRunFiltered, key_)
+      // input tuple format: [join_id, channel_id, id, output, prev_state, ...]
+      // output tuple format: [join_id, channel_id, id, new_state, ...]
+      | map{ tup ->
+        def new_state = workflowArgs.toState(tup.drop(2).take(3))
+        tup.take(3) + [new_state] + tup.drop(5)
+      }
+    if (workflowArgs.auto.publish == "state") {
+      def chPublishFiles = chPublishWithPreviousState
+        // input tuple format: [join_id, channel_id, id, new_state, ...]
+        // output tuple format: [join_id, channel_id, id, new_state]
+        | map{ tup ->
+          tup.take(4)
+        }
+
+      safeJoin(chPublishFiles, chArgsWithDefaults, key_)
+        // input tuple format: [join_id, channel_id, id, new_state, orig_state, ...]
+        // output tuple format: [id, new_state, orig_state]
+        | map { tup ->
+          tup.drop(2).take(3)
+        }
+        | publishFilesByConfig(key: key_, config: meta.config)
+    }
+    // Join the state from the events that were emitted from different channels
+    def chJoined = chInitialOutputProcessed
+      | map {tuple ->
+        def join_id = tuple[0]
+        def channel_id = tuple[1]
+        def id = tuple[2]
+        def other = tuple.drop(3)
+        // Below, groupTuple is used to join the events. To make sure resuming a workflow
+        // keeps working, the output state must be deterministic. This means the state needs to be
+        // sorted with groupTuple's has a 'sort' argument. This argument can be set to 'hash',
+        // but hashing the state when it is large can be problematic in terms of performance.
+        // Therefore, a custom comparator function is provided. We add the channel ID to the 
+        // states so that we can use the channel ID to sort the items. 
+        def stateWithChannelID = [[channel_id] * other.size(), other].transpose()
+        // A comparator that is provided to groupTuple's 'sort' argument is applied
+        // to all elements of the event tuple (that is not the 'id'). The comparator
+        // closure that is used below expects the input to be List. So the join_id and
+        // channel_id must also be wrapped in a list. 
+        [[join_id], [channel_id], id] + stateWithChannelID
+      }
+      | groupTuple(by: 2, sort: {a, b -> a[0] <=> b[0]}, size: chInitialOutputList.size(), remainder: true)
+      | map {join_ids, _, id, statesWithChannelID ->
+        // Remove the channel IDs from the states
+        def states = statesWithChannelID.collect{it[1]}
+        def newJoinId = join_ids.flatten().unique{a, b -> a <=> b}
+        assert newJoinId.size() == 1: "Multiple events were emitted for '$id'."
+        def newJoinIdUnique = newJoinId[0]
+        def newState = states.inject([:]){ old_state, state_to_add ->
+          def stateToAddNoMultiple = state_to_add.findAll{k, v -> !multipleArgs.contains(k)}
+          // First add non multiple arguments
+
+          def overlap = old_state.keySet().intersect(stateToAddNoMultiple.keySet())
+          assert overlap.isEmpty() : "ID $id: multiple entries for " + 
+            " argument(s) $overlap were emitted."
+          def return_state = old_state + stateToAddNoMultiple
+
+          // Add `multiple: true` arguments
+          def stateToAddMultiple = state_to_add.findAll{k, v -> multipleArgs.contains(k)}
+          stateToAddMultiple.each {k, v ->
+            def currentKey = return_state.getOrDefault(k, [])
+            def currentKeyList = currentKey instanceof List ? currentKey : [currentKey]
+            currentKeyList.add(v)
+            return_state[k] = currentKeyList
+          }
+          return return_state
+        }
+
+        _checkAllRequiredOuputsPresent(newState, meta.config, id, key_)
+
+        // simplify output if need be
+        if (workflowArgs.auto.simplifyOutput && newState.size() == 1) {
+          newState = newState.values()[0]
+        }
+
+        return [newJoinIdUnique, id, newState]
+      }
+    
     // join the output [prev_id, new_id, output] with the previous state [prev_id, state, ...]
-    def chNewState = safeJoin(chInitialOutput, chRunFiltered, key_)
+    def chNewState = safeJoin(chJoined, chRunFiltered, key_)
       // input tuple format: [join_id, id, output, prev_state, ...]
       // output tuple format: [join_id, id, new_state, ...]
       | map{ tup ->
@@ -2755,23 +2989,21 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     if (workflowArgs.auto.publish == "state") {
-      def chPublish = chNewState
+      def chPublishStates = chNewState
         // input tuple format: [join_id, id, new_state, ...]
         // output tuple format: [join_id, id, new_state]
         | map{ tup ->
           tup.take(3)
         }
 
-      safeJoin(chPublish, chArgsWithDefaults, key_)
+      safeJoin(chPublishStates, chArgsWithDefaults, key_)
         // input tuple format: [join_id, id, new_state, orig_state, ...]
         // output tuple format: [id, new_state, orig_state]
         | map { tup ->
           tup.drop(1).take(3)
-      }
+        }
         | publishStatesByConfig(key: key_, config: meta.config)
     }
-
-    // remove join_id and meta
     chReturn = chNewState
       | map { tup ->
         // input tuple format: [join_id, id, new_state, ...]
@@ -2876,6 +3108,10 @@ meta = [
   ],
   "description" : "From a directory containing fastq files, gather the files per sample \nand validate according to the contents of the sample sheet.\n",
   "status" : "enabled",
+  "scope" : {
+    "image" : "public",
+    "target" : "public"
+  },
   "requirements" : {
     "commands" : [
       "ps"
@@ -2972,10 +3208,10 @@ meta = [
     "runner" : "nextflow",
     "engine" : "native|native",
     "output" : "target/nextflow/dataflow/gather_fastqs_and_validate",
-    "viash_version" : "0.9.0",
-    "git_commit" : "d7d3b3e1de64f07a8b161b68a60098103ff691fb",
-    "git_remote" : "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex",
-    "git_tag" : "v0.1.1-14-gd7d3b3e"
+    "viash_version" : "0.9.1",
+    "git_commit" : "8da2bf20c5727df1fcdcc997ae87caf562ac4983",
+    "git_remote" : "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex",
+    "git_tag" : "v0.1.1-15-g8da2bf2"
   },
   "package_config" : {
     "name" : "demultiplex",
@@ -2989,7 +3225,7 @@ meta = [
         }
       ]
     },
-    "viash_version" : "0.9.0",
+    "viash_version" : "0.9.1",
     "source" : "src",
     "target" : "target",
     "config_mods" : [
diff --git a/target/nextflow/demultiplex/.config.vsh.yaml b/target/nextflow/demultiplex/.config.vsh.yaml
index 895f858..83188aa 100644
--- a/target/nextflow/demultiplex/.config.vsh.yaml
+++ b/target/nextflow/demultiplex/.config.vsh.yaml
@@ -116,6 +116,9 @@ test_resources:
   entrypoint: "test_bases2fastq"
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -235,10 +238,10 @@ build_info:
   engine: "native|native"
   output: "target/nextflow/demultiplex"
   executable: "target/nextflow/demultiplex/main.nf"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
   dependencies:
   - "target/nextflow/io/untar"
   - "target/nextflow/dataflow/gather_fastqs_and_validate"
@@ -256,7 +259,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/nextflow/demultiplex/main.nf b/target/nextflow/demultiplex/main.nf
index fb5e73e..4155d8e 100644
--- a/target/nextflow/demultiplex/main.nf
+++ b/target/nextflow/demultiplex/main.nf
@@ -1,6 +1,6 @@
 // demultiplex main
 // 
-// This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+// This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 // work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 // Intuitive.
 // 
@@ -173,7 +173,7 @@ def _checkArgumentType(String stage, Map par, Object value, String errorIdentifi
 Map _processInputValues(Map inputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
     config.allArguments.each { arg ->
-      if (arg.required) {
+      if (arg.required && arg.direction == "input") {
         assert inputs.containsKey(arg.plainName) && inputs.get(arg.plainName) != null : 
           "Error in module '${key}' id '${id}': required input argument '${arg.plainName}' is missing"
       }
@@ -192,15 +192,8 @@ Map _processInputValues(Map inputs, Map config, String id, String key) {
 }
 
 // helper file: 'src/main/resources/io/viash/runners/nextflow/arguments/_processOutputValues.nf'
-Map _processOutputValues(Map outputs, Map config, String id, String key) {
+Map _checkValidOutputArgument(Map outputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
-    config.allArguments.each { arg ->
-      if (arg.direction == "output" && arg.required) {
-        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
-          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
-      }
-    }
-
     outputs = outputs.collectEntries { name, value ->
       def par = config.allArguments.find { it.plainName == name && it.direction == "output" }
       assert par != null : "Error in module '${key}' id '${id}': '${name}' is not a valid output argument"
@@ -213,6 +206,16 @@ Map _processOutputValues(Map outputs, Map config, String id, String key) {
   return outputs
 }
 
+void _checkAllRequiredOuputsPresent(Map outputs, Map config, String id, String key) {
+  if (!workflow.stubRun) {
+    config.allArguments.each { arg ->
+      if (arg.direction == "output" && arg.required) {
+        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
+          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
+      }
+    }
+  }
+}
 // helper file: 'src/main/resources/io/viash/runners/nextflow/channel/IDChecker.nf'
 class IDChecker {
   final def items = [] as Set
@@ -1666,6 +1669,162 @@ def joinStates(Closure apply_) {
   }
   return joinStatesWf
 }
+// helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishFiles.nf'
+def publishFiles(Map args) {
+  def key_ = args.get("key")
+
+  assert key_ != null : "publishFiles: key must be specified"
+  
+  workflow publishFilesWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1]
+
+          // the input files and the target output filenames
+          def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
+          def inputFiles_ = inputoutputFilenames_[0]
+          def outputFilenames_ = inputoutputFilenames_[1]
+
+          [id_, inputFiles_, outputFilenames_]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesWf
+}
+
+process publishFilesProc {
+  // todo: check publishpath?
+  publishDir path: "${getPublishDir()}/", mode: "copy"
+  tag "$id"
+  input:
+    tuple val(id), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+  output:
+    tuple val(id), path{outputFiles}
+  script:
+  def copyCommands = [
+    inputFiles instanceof List ? inputFiles : [inputFiles],
+    outputFiles instanceof List ? outputFiles : [outputFiles]
+  ]
+    .transpose()
+    .collectMany{infile, outfile ->
+      if (infile.toString() != outfile.toString()) {
+        [
+          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
+          "cp -r '${infile.toString()}' '${outfile.toString()}'"
+        ]
+      } else {
+        // no need to copy if infile is the same as outfile
+        []
+      }
+    }
+  """
+  echo "Copying output files to destination folder"
+  ${copyCommands.join("\n  ")}
+  """
+}
+
+
+// this assumes that the state contains no other values other than those specified in the config
+def publishFilesByConfig(Map args) {
+  def config = args.get("config")
+  assert config != null : "publishFilesByConfig: config must be specified"
+
+  def key_ = args.get("key", config.name)
+  assert key_ != null : "publishFilesByConfig: key must be specified"
+  
+  workflow publishFilesSimpleWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1] // e.g. [output: new File("myoutput.h5ad"), k: 10]
+          def origState_ = tup[2] // e.g. [output: '$id.$key.foo.h5ad']
+
+
+          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          //   - key is a String
+          //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
+          //   - inputPath is a List[Path]
+          //   - outputFilename is a List[String]
+          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
+          def processedState =
+            config.allArguments
+              .findAll { it.direction == "output" }
+              .collectMany { par ->
+                def plainName_ = par.plainName
+                // if the state does not contain the key, it's an
+                // optional argument for which the component did 
+                // not generate any output OR multiple channels were emitted
+                // and the output was just not added to using the channel
+                // that is now being parsed
+                if (!state_.containsKey(plainName_)) {
+                  return []
+                }
+                def value = state_[plainName_]
+                // if the parameter is not a file, it should be stored
+                // in the state as-is, but is not something that needs 
+                // to be copied from the source path to the dest path
+                if (par.type != "file") {
+                  return [[inputPath: [], outputFilename: []]]
+                }
+                // if the orig state does not contain this filename,
+                // it's an optional argument for which the user specified
+                // that it should not be returned as a state
+                if (!origState_.containsKey(plainName_)) {
+                  return []
+                }
+                def filenameTemplate = origState_[plainName_]
+                // if the pararameter is multiple: true, fetch the template
+                if (par.multiple && filenameTemplate instanceof List) {
+                  filenameTemplate = filenameTemplate[0]
+                }
+                // instantiate the template
+                def filename = filenameTemplate
+                  .replaceAll('\\$id', id_)
+                  .replaceAll('\\$\\{id\\}', id_)
+                  .replaceAll('\\$key', key_)
+                  .replaceAll('\\$\\{key\\}', key_)
+                if (par.multiple) {
+                  // if the parameter is multiple: true, the filename
+                  // should contain a wildcard '*' that is replaced with
+                  // the index of the file
+                  assert filename.contains("*") : "Module '${key_}' id '${id_}': Multiple output files specified, but no wildcard '*' in the filename: ${filename}"
+                  def outputPerFile = value.withIndex().collect{ val, ix ->
+                    def filename_ix = filename.replace("*", ix.toString())
+                    def inputPath = val instanceof File ? val.toPath() : val
+                    [inputPath: inputPath, outputFilename: filename_ix]
+                  }
+                  def transposedOutputs = ["inputPath", "outputFilename"].collectEntries{ key -> 
+                    [key, outputPerFile.collect{dic -> dic[key]}]
+                  }
+                  return [[key: plainName_] + transposedOutputs]
+                } else {
+                  def value_ = java.nio.file.Paths.get(filename)
+                  def inputPath = value instanceof File ? value.toPath() : value
+                  return [[inputPath: [inputPath], outputFilename: [filename]]]
+                }
+              }
+          
+          def inputPaths = processedState.collectMany{it.inputPath}
+          def outputFilenames = processedState.collectMany{it.outputFilename}
+          
+
+          [id_, inputPaths, outputFilenames]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesSimpleWf
+}
+
+
+
+
 // helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishStates.nf'
 def collectFiles(obj) {
   if (obj instanceof java.io.File || obj instanceof Path)  {
@@ -1723,8 +1882,6 @@ def publishStates(Map args) {
 
           // the input files and the target output filenames
           def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
-          def inputFiles_ = inputoutputFilenames_[0]
-          def outputFilenames_ = inputoutputFilenames_[1]
 
           def yamlFilename = yamlTemplate_
             .replaceAll('\\$id', id_)
@@ -1737,7 +1894,7 @@ def publishStates(Map args) {
           // convert state to yaml blob
           def yamlBlob_ = toRelativeTaggedYamlBlob([id: id_] + state_, java.nio.file.Paths.get(yamlFilename))
 
-          [id_, yamlBlob_, yamlFilename, inputFiles_, outputFilenames_]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -1749,33 +1906,17 @@ process publishStatesProc {
   publishDir path: "${getPublishDir()}/", mode: "copy"
   tag "$id"
   input:
-    tuple val(id), val(yamlBlob), val(yamlFile), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+    tuple val(id), val(yamlBlob), val(yamlFile)
   output:
-    tuple val(id), path{[yamlFile] + outputFiles}
+    tuple val(id), path{[yamlFile]}
   script:
-  def copyCommands = [
-    inputFiles instanceof List ? inputFiles : [inputFiles],
-    outputFiles instanceof List ? outputFiles : [outputFiles]
-  ]
-    .transpose()
-    .collectMany{infile, outfile ->
-      if (infile.toString() != outfile.toString()) {
-        [
-          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
-          "cp -r '${infile.toString()}' '${outfile.toString()}'"
-        ]
-      } else {
-        // no need to copy if infile is the same as outfile
-        []
-      }
-    }
   """
-mkdir -p "\$(dirname '${yamlFile}')"
-echo "Storing state as yaml"
-echo '${yamlBlob}' > '${yamlFile}'
-echo "Copying output files to destination folder"
-${copyCommands.join("\n  ")}
-"""
+  mkdir -p "\$(dirname '${yamlFile}')"
+  echo "Storing state as yaml"
+  cat > '${yamlFile}' << HERE
+${yamlBlob}
+HERE
+  """
 }
 
 
@@ -1806,13 +1947,10 @@ def publishStatesByConfig(Map args) {
             .replaceAll('\\$\\{key\\}', key_)
           def yamlDir = java.nio.file.Paths.get(yamlFilename).getParent()
 
-          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          // the processed state is a list of [key, value] tuples, where
           //   - key is a String
           //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
-          //   - inputPath is a List[Path]
-          //   - outputFilename is a List[String]
           //   - (key, value) are the tuples that will be saved to the state.yaml file
-          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
           def processedState =
             config.allArguments
               .findAll { it.direction == "output" }
@@ -1829,7 +1967,7 @@ def publishStatesByConfig(Map args) {
                 // in the state as-is, but is not something that needs 
                 // to be copied from the source path to the dest path
                 if (par.type != "file") {
-                  return [[key: plainName_, value: value, inputPath: [], outputFilename: []]]
+                  return [[key: plainName_, value: value]]
                 }
                 // if the orig state does not contain this filename,
                 // it's an optional argument for which the user specified
@@ -1860,13 +1998,9 @@ def publishStatesByConfig(Map args) {
                     if (yamlDir != null) {
                       value_ = yamlDir.relativize(value_)
                     }
-                    def inputPath = val instanceof File ? val.toPath() : val
-                    [value: value_, inputPath: inputPath, outputFilename: filename_ix]
+                    return value_
                   }
-                  def transposedOutputs = ["value", "inputPath", "outputFilename"].collectEntries{ key -> 
-                    [key, outputPerFile.collect{dic -> dic[key]}]
-                  }
-                  return [[key: plainName_] + transposedOutputs]
+                  return [["key": plainName_, "value": outputPerFile]]
                 } else {
                   def value_ = java.nio.file.Paths.get(filename)
                   // if id contains a slash
@@ -1874,18 +2008,17 @@ def publishStatesByConfig(Map args) {
                     value_ = yamlDir.relativize(value_)
                   }
                   def inputPath = value instanceof File ? value.toPath() : value
-                  return [[key: plainName_, value: value_, inputPath: [inputPath], outputFilename: [filename]]]
+                  return [["key": plainName_, value: value_]]
                 }
               }
+              
           
           def updatedState_ = processedState.collectEntries{[it.key, it.value]}
-          def inputPaths = processedState.collectMany{it.inputPath}
-          def outputFilenames = processedState.collectMany{it.outputFilename}
           
           // convert state to yaml blob
           def yamlBlob_ = toTaggedYamlBlob([id: id_] + updatedState_)
 
-          [id_, yamlBlob_, yamlFilename, inputPaths, outputFilenames]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -2559,7 +2692,8 @@ def _debug(workflowArgs, debugKey) {
 def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
   def workflowArgs = processWorkflowArgs(args, defaultWfArgs, meta)
   def key_ = workflowArgs["key"]
-  
+  def multipleArgs = meta.config.allArguments.findAll{ it.multiple }.collect{it.plainName}
+
   workflow workflowInstance {
     take: input_
 
@@ -2716,12 +2850,36 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     // TODO: move some of the _meta.join_id wrangling to the safeJoin() function.
-    def chInitialOutput = chArgsWithDefaults
+    def chInitialOutputMulti = chArgsWithDefaults
       | _debug(workflowArgs, "processed")
       // run workflow
       | innerWorkflowFactory(workflowArgs)
-      // check output tuple
-      | map { id_, output_ ->
+    def chInitialOutputList = chInitialOutputMulti instanceof List ? chInitialOutputMulti : [chInitialOutputMulti]
+    assert chInitialOutputList.size() > 0: "should have emitted at least one output channel"
+    // Add a channel ID to the events, which designates the channel the event was emitted from as a running number
+    // This number is used to sort the events later when the events are gathered from across the channels.
+    def chInitialOutputListWithIndexedEvents = chInitialOutputList.withIndex().collect{channel, channelIndex ->
+      def newChannel = channel
+        | map {tuple ->
+          assert tuple instanceof List : 
+          "Error in module '${key_}': element in output channel should be a tuple [id, data, ...otherargs...]\n" +
+          "  Example: [\"id\", [input: file('foo.txt'), arg: 10]].\n" +
+          "  Expected class: List. Found: tuple.getClass() is ${tuple.getClass()}"
+        
+          def newEvent = [channelIndex] + tuple
+          return newEvent
+        }
+      return newChannel
+    }
+    // Put the events into 1 channel, cover case where there is only one channel is emitted
+    def chInitialOutput = chInitialOutputList.size() > 1 ? \
+      chInitialOutputListWithIndexedEvents[0].mix(*chInitialOutputListWithIndexedEvents.tail()) : \
+      chInitialOutputListWithIndexedEvents[0]
+    def chInitialOutputProcessed = chInitialOutput
+      | map { tuple  ->
+        def channelId = tuple[0]
+        def id_ = tuple[1]
+        def output_ = tuple[2]
 
         // see if output map contains metadata
         def meta_ =
@@ -2734,19 +2892,95 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
         output_ = output_.findAll{k, v -> k != "_meta"}
 
         // check value types
-        output_ = _processOutputValues(output_, meta.config, id_, key_)
+        output_ = _checkValidOutputArgument(output_, meta.config, id_, key_)
 
-        // simplify output if need be
-        if (workflowArgs.auto.simplifyOutput && output_.size() == 1) {
-          output_ = output_.values()[0]
-        }
-
-        [join_id, id_, output_]
+        [join_id, channelId, id_, output_]
       }
       // | view{"chInitialOutput: ${it.take(3)}"}
 
+    // join the output [prev_id, channel_id, new_id, output] with the previous state [prev_id, state, ...]
+    def chPublishWithPreviousState = safeJoin(chInitialOutputProcessed, chRunFiltered, key_)
+      // input tuple format: [join_id, channel_id, id, output, prev_state, ...]
+      // output tuple format: [join_id, channel_id, id, new_state, ...]
+      | map{ tup ->
+        def new_state = workflowArgs.toState(tup.drop(2).take(3))
+        tup.take(3) + [new_state] + tup.drop(5)
+      }
+    if (workflowArgs.auto.publish == "state") {
+      def chPublishFiles = chPublishWithPreviousState
+        // input tuple format: [join_id, channel_id, id, new_state, ...]
+        // output tuple format: [join_id, channel_id, id, new_state]
+        | map{ tup ->
+          tup.take(4)
+        }
+
+      safeJoin(chPublishFiles, chArgsWithDefaults, key_)
+        // input tuple format: [join_id, channel_id, id, new_state, orig_state, ...]
+        // output tuple format: [id, new_state, orig_state]
+        | map { tup ->
+          tup.drop(2).take(3)
+        }
+        | publishFilesByConfig(key: key_, config: meta.config)
+    }
+    // Join the state from the events that were emitted from different channels
+    def chJoined = chInitialOutputProcessed
+      | map {tuple ->
+        def join_id = tuple[0]
+        def channel_id = tuple[1]
+        def id = tuple[2]
+        def other = tuple.drop(3)
+        // Below, groupTuple is used to join the events. To make sure resuming a workflow
+        // keeps working, the output state must be deterministic. This means the state needs to be
+        // sorted with groupTuple's has a 'sort' argument. This argument can be set to 'hash',
+        // but hashing the state when it is large can be problematic in terms of performance.
+        // Therefore, a custom comparator function is provided. We add the channel ID to the 
+        // states so that we can use the channel ID to sort the items. 
+        def stateWithChannelID = [[channel_id] * other.size(), other].transpose()
+        // A comparator that is provided to groupTuple's 'sort' argument is applied
+        // to all elements of the event tuple (that is not the 'id'). The comparator
+        // closure that is used below expects the input to be List. So the join_id and
+        // channel_id must also be wrapped in a list. 
+        [[join_id], [channel_id], id] + stateWithChannelID
+      }
+      | groupTuple(by: 2, sort: {a, b -> a[0] <=> b[0]}, size: chInitialOutputList.size(), remainder: true)
+      | map {join_ids, _, id, statesWithChannelID ->
+        // Remove the channel IDs from the states
+        def states = statesWithChannelID.collect{it[1]}
+        def newJoinId = join_ids.flatten().unique{a, b -> a <=> b}
+        assert newJoinId.size() == 1: "Multiple events were emitted for '$id'."
+        def newJoinIdUnique = newJoinId[0]
+        def newState = states.inject([:]){ old_state, state_to_add ->
+          def stateToAddNoMultiple = state_to_add.findAll{k, v -> !multipleArgs.contains(k)}
+          // First add non multiple arguments
+
+          def overlap = old_state.keySet().intersect(stateToAddNoMultiple.keySet())
+          assert overlap.isEmpty() : "ID $id: multiple entries for " + 
+            " argument(s) $overlap were emitted."
+          def return_state = old_state + stateToAddNoMultiple
+
+          // Add `multiple: true` arguments
+          def stateToAddMultiple = state_to_add.findAll{k, v -> multipleArgs.contains(k)}
+          stateToAddMultiple.each {k, v ->
+            def currentKey = return_state.getOrDefault(k, [])
+            def currentKeyList = currentKey instanceof List ? currentKey : [currentKey]
+            currentKeyList.add(v)
+            return_state[k] = currentKeyList
+          }
+          return return_state
+        }
+
+        _checkAllRequiredOuputsPresent(newState, meta.config, id, key_)
+
+        // simplify output if need be
+        if (workflowArgs.auto.simplifyOutput && newState.size() == 1) {
+          newState = newState.values()[0]
+        }
+
+        return [newJoinIdUnique, id, newState]
+      }
+    
     // join the output [prev_id, new_id, output] with the previous state [prev_id, state, ...]
-    def chNewState = safeJoin(chInitialOutput, chRunFiltered, key_)
+    def chNewState = safeJoin(chJoined, chRunFiltered, key_)
       // input tuple format: [join_id, id, output, prev_state, ...]
       // output tuple format: [join_id, id, new_state, ...]
       | map{ tup ->
@@ -2755,23 +2989,21 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     if (workflowArgs.auto.publish == "state") {
-      def chPublish = chNewState
+      def chPublishStates = chNewState
         // input tuple format: [join_id, id, new_state, ...]
         // output tuple format: [join_id, id, new_state]
         | map{ tup ->
           tup.take(3)
         }
 
-      safeJoin(chPublish, chArgsWithDefaults, key_)
+      safeJoin(chPublishStates, chArgsWithDefaults, key_)
         // input tuple format: [join_id, id, new_state, orig_state, ...]
         // output tuple format: [id, new_state, orig_state]
         | map { tup ->
           tup.drop(1).take(3)
-      }
+        }
         | publishStatesByConfig(key: key_, config: meta.config)
     }
-
-    // remove join_id and meta
     chReturn = chNewState
       | map { tup ->
         // input tuple format: [join_id, id, new_state, ...]
@@ -2946,6 +3178,10 @@ meta = [
     }
   ],
   "status" : "enabled",
+  "scope" : {
+    "image" : "public",
+    "target" : "public"
+  },
   "requirements" : {
     "commands" : [
       "ps"
@@ -3108,10 +3344,10 @@ meta = [
     "runner" : "nextflow",
     "engine" : "native|native",
     "output" : "target/nextflow/demultiplex",
-    "viash_version" : "0.9.0",
-    "git_commit" : "d7d3b3e1de64f07a8b161b68a60098103ff691fb",
-    "git_remote" : "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex",
-    "git_tag" : "v0.1.1-14-gd7d3b3e"
+    "viash_version" : "0.9.1",
+    "git_commit" : "8da2bf20c5727df1fcdcc997ae87caf562ac4983",
+    "git_remote" : "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex",
+    "git_tag" : "v0.1.1-15-g8da2bf2"
   },
   "package_config" : {
     "name" : "demultiplex",
@@ -3125,7 +3361,7 @@ meta = [
         }
       ]
     },
-    "viash_version" : "0.9.0",
+    "viash_version" : "0.9.1",
     "source" : "src",
     "target" : "target",
     "config_mods" : [
diff --git a/target/nextflow/io/interop_summary_to_csv/.config.vsh.yaml b/target/nextflow/io/interop_summary_to_csv/.config.vsh.yaml
index 9321218..64234bf 100644
--- a/target/nextflow/io/interop_summary_to_csv/.config.vsh.yaml
+++ b/target/nextflow/io/interop_summary_to_csv/.config.vsh.yaml
@@ -43,6 +43,9 @@ resources:
   dest: "nextflow_labels.config"
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -145,10 +148,10 @@ build_info:
   engine: "docker|native"
   output: "target/nextflow/io/interop_summary_to_csv"
   executable: "target/nextflow/io/interop_summary_to_csv/main.nf"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -157,7 +160,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/nextflow/io/interop_summary_to_csv/main.nf b/target/nextflow/io/interop_summary_to_csv/main.nf
index 84a7dfc..b339aea 100644
--- a/target/nextflow/io/interop_summary_to_csv/main.nf
+++ b/target/nextflow/io/interop_summary_to_csv/main.nf
@@ -1,6 +1,6 @@
 // interop_summary_to_csv main
 // 
-// This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+// This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 // work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 // Intuitive.
 // 
@@ -173,7 +173,7 @@ def _checkArgumentType(String stage, Map par, Object value, String errorIdentifi
 Map _processInputValues(Map inputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
     config.allArguments.each { arg ->
-      if (arg.required) {
+      if (arg.required && arg.direction == "input") {
         assert inputs.containsKey(arg.plainName) && inputs.get(arg.plainName) != null : 
           "Error in module '${key}' id '${id}': required input argument '${arg.plainName}' is missing"
       }
@@ -192,15 +192,8 @@ Map _processInputValues(Map inputs, Map config, String id, String key) {
 }
 
 // helper file: 'src/main/resources/io/viash/runners/nextflow/arguments/_processOutputValues.nf'
-Map _processOutputValues(Map outputs, Map config, String id, String key) {
+Map _checkValidOutputArgument(Map outputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
-    config.allArguments.each { arg ->
-      if (arg.direction == "output" && arg.required) {
-        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
-          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
-      }
-    }
-
     outputs = outputs.collectEntries { name, value ->
       def par = config.allArguments.find { it.plainName == name && it.direction == "output" }
       assert par != null : "Error in module '${key}' id '${id}': '${name}' is not a valid output argument"
@@ -213,6 +206,16 @@ Map _processOutputValues(Map outputs, Map config, String id, String key) {
   return outputs
 }
 
+void _checkAllRequiredOuputsPresent(Map outputs, Map config, String id, String key) {
+  if (!workflow.stubRun) {
+    config.allArguments.each { arg ->
+      if (arg.direction == "output" && arg.required) {
+        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
+          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
+      }
+    }
+  }
+}
 // helper file: 'src/main/resources/io/viash/runners/nextflow/channel/IDChecker.nf'
 class IDChecker {
   final def items = [] as Set
@@ -1666,6 +1669,162 @@ def joinStates(Closure apply_) {
   }
   return joinStatesWf
 }
+// helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishFiles.nf'
+def publishFiles(Map args) {
+  def key_ = args.get("key")
+
+  assert key_ != null : "publishFiles: key must be specified"
+  
+  workflow publishFilesWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1]
+
+          // the input files and the target output filenames
+          def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
+          def inputFiles_ = inputoutputFilenames_[0]
+          def outputFilenames_ = inputoutputFilenames_[1]
+
+          [id_, inputFiles_, outputFilenames_]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesWf
+}
+
+process publishFilesProc {
+  // todo: check publishpath?
+  publishDir path: "${getPublishDir()}/", mode: "copy"
+  tag "$id"
+  input:
+    tuple val(id), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+  output:
+    tuple val(id), path{outputFiles}
+  script:
+  def copyCommands = [
+    inputFiles instanceof List ? inputFiles : [inputFiles],
+    outputFiles instanceof List ? outputFiles : [outputFiles]
+  ]
+    .transpose()
+    .collectMany{infile, outfile ->
+      if (infile.toString() != outfile.toString()) {
+        [
+          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
+          "cp -r '${infile.toString()}' '${outfile.toString()}'"
+        ]
+      } else {
+        // no need to copy if infile is the same as outfile
+        []
+      }
+    }
+  """
+  echo "Copying output files to destination folder"
+  ${copyCommands.join("\n  ")}
+  """
+}
+
+
+// this assumes that the state contains no other values other than those specified in the config
+def publishFilesByConfig(Map args) {
+  def config = args.get("config")
+  assert config != null : "publishFilesByConfig: config must be specified"
+
+  def key_ = args.get("key", config.name)
+  assert key_ != null : "publishFilesByConfig: key must be specified"
+  
+  workflow publishFilesSimpleWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1] // e.g. [output: new File("myoutput.h5ad"), k: 10]
+          def origState_ = tup[2] // e.g. [output: '$id.$key.foo.h5ad']
+
+
+          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          //   - key is a String
+          //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
+          //   - inputPath is a List[Path]
+          //   - outputFilename is a List[String]
+          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
+          def processedState =
+            config.allArguments
+              .findAll { it.direction == "output" }
+              .collectMany { par ->
+                def plainName_ = par.plainName
+                // if the state does not contain the key, it's an
+                // optional argument for which the component did 
+                // not generate any output OR multiple channels were emitted
+                // and the output was just not added to using the channel
+                // that is now being parsed
+                if (!state_.containsKey(plainName_)) {
+                  return []
+                }
+                def value = state_[plainName_]
+                // if the parameter is not a file, it should be stored
+                // in the state as-is, but is not something that needs 
+                // to be copied from the source path to the dest path
+                if (par.type != "file") {
+                  return [[inputPath: [], outputFilename: []]]
+                }
+                // if the orig state does not contain this filename,
+                // it's an optional argument for which the user specified
+                // that it should not be returned as a state
+                if (!origState_.containsKey(plainName_)) {
+                  return []
+                }
+                def filenameTemplate = origState_[plainName_]
+                // if the pararameter is multiple: true, fetch the template
+                if (par.multiple && filenameTemplate instanceof List) {
+                  filenameTemplate = filenameTemplate[0]
+                }
+                // instantiate the template
+                def filename = filenameTemplate
+                  .replaceAll('\\$id', id_)
+                  .replaceAll('\\$\\{id\\}', id_)
+                  .replaceAll('\\$key', key_)
+                  .replaceAll('\\$\\{key\\}', key_)
+                if (par.multiple) {
+                  // if the parameter is multiple: true, the filename
+                  // should contain a wildcard '*' that is replaced with
+                  // the index of the file
+                  assert filename.contains("*") : "Module '${key_}' id '${id_}': Multiple output files specified, but no wildcard '*' in the filename: ${filename}"
+                  def outputPerFile = value.withIndex().collect{ val, ix ->
+                    def filename_ix = filename.replace("*", ix.toString())
+                    def inputPath = val instanceof File ? val.toPath() : val
+                    [inputPath: inputPath, outputFilename: filename_ix]
+                  }
+                  def transposedOutputs = ["inputPath", "outputFilename"].collectEntries{ key -> 
+                    [key, outputPerFile.collect{dic -> dic[key]}]
+                  }
+                  return [[key: plainName_] + transposedOutputs]
+                } else {
+                  def value_ = java.nio.file.Paths.get(filename)
+                  def inputPath = value instanceof File ? value.toPath() : value
+                  return [[inputPath: [inputPath], outputFilename: [filename]]]
+                }
+              }
+          
+          def inputPaths = processedState.collectMany{it.inputPath}
+          def outputFilenames = processedState.collectMany{it.outputFilename}
+          
+
+          [id_, inputPaths, outputFilenames]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesSimpleWf
+}
+
+
+
+
 // helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishStates.nf'
 def collectFiles(obj) {
   if (obj instanceof java.io.File || obj instanceof Path)  {
@@ -1723,8 +1882,6 @@ def publishStates(Map args) {
 
           // the input files and the target output filenames
           def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
-          def inputFiles_ = inputoutputFilenames_[0]
-          def outputFilenames_ = inputoutputFilenames_[1]
 
           def yamlFilename = yamlTemplate_
             .replaceAll('\\$id', id_)
@@ -1737,7 +1894,7 @@ def publishStates(Map args) {
           // convert state to yaml blob
           def yamlBlob_ = toRelativeTaggedYamlBlob([id: id_] + state_, java.nio.file.Paths.get(yamlFilename))
 
-          [id_, yamlBlob_, yamlFilename, inputFiles_, outputFilenames_]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -1749,33 +1906,17 @@ process publishStatesProc {
   publishDir path: "${getPublishDir()}/", mode: "copy"
   tag "$id"
   input:
-    tuple val(id), val(yamlBlob), val(yamlFile), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+    tuple val(id), val(yamlBlob), val(yamlFile)
   output:
-    tuple val(id), path{[yamlFile] + outputFiles}
+    tuple val(id), path{[yamlFile]}
   script:
-  def copyCommands = [
-    inputFiles instanceof List ? inputFiles : [inputFiles],
-    outputFiles instanceof List ? outputFiles : [outputFiles]
-  ]
-    .transpose()
-    .collectMany{infile, outfile ->
-      if (infile.toString() != outfile.toString()) {
-        [
-          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
-          "cp -r '${infile.toString()}' '${outfile.toString()}'"
-        ]
-      } else {
-        // no need to copy if infile is the same as outfile
-        []
-      }
-    }
   """
-mkdir -p "\$(dirname '${yamlFile}')"
-echo "Storing state as yaml"
-echo '${yamlBlob}' > '${yamlFile}'
-echo "Copying output files to destination folder"
-${copyCommands.join("\n  ")}
-"""
+  mkdir -p "\$(dirname '${yamlFile}')"
+  echo "Storing state as yaml"
+  cat > '${yamlFile}' << HERE
+${yamlBlob}
+HERE
+  """
 }
 
 
@@ -1806,13 +1947,10 @@ def publishStatesByConfig(Map args) {
             .replaceAll('\\$\\{key\\}', key_)
           def yamlDir = java.nio.file.Paths.get(yamlFilename).getParent()
 
-          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          // the processed state is a list of [key, value] tuples, where
           //   - key is a String
           //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
-          //   - inputPath is a List[Path]
-          //   - outputFilename is a List[String]
           //   - (key, value) are the tuples that will be saved to the state.yaml file
-          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
           def processedState =
             config.allArguments
               .findAll { it.direction == "output" }
@@ -1829,7 +1967,7 @@ def publishStatesByConfig(Map args) {
                 // in the state as-is, but is not something that needs 
                 // to be copied from the source path to the dest path
                 if (par.type != "file") {
-                  return [[key: plainName_, value: value, inputPath: [], outputFilename: []]]
+                  return [[key: plainName_, value: value]]
                 }
                 // if the orig state does not contain this filename,
                 // it's an optional argument for which the user specified
@@ -1860,13 +1998,9 @@ def publishStatesByConfig(Map args) {
                     if (yamlDir != null) {
                       value_ = yamlDir.relativize(value_)
                     }
-                    def inputPath = val instanceof File ? val.toPath() : val
-                    [value: value_, inputPath: inputPath, outputFilename: filename_ix]
+                    return value_
                   }
-                  def transposedOutputs = ["value", "inputPath", "outputFilename"].collectEntries{ key -> 
-                    [key, outputPerFile.collect{dic -> dic[key]}]
-                  }
-                  return [[key: plainName_] + transposedOutputs]
+                  return [["key": plainName_, "value": outputPerFile]]
                 } else {
                   def value_ = java.nio.file.Paths.get(filename)
                   // if id contains a slash
@@ -1874,18 +2008,17 @@ def publishStatesByConfig(Map args) {
                     value_ = yamlDir.relativize(value_)
                   }
                   def inputPath = value instanceof File ? value.toPath() : value
-                  return [[key: plainName_, value: value_, inputPath: [inputPath], outputFilename: [filename]]]
+                  return [["key": plainName_, value: value_]]
                 }
               }
+              
           
           def updatedState_ = processedState.collectEntries{[it.key, it.value]}
-          def inputPaths = processedState.collectMany{it.inputPath}
-          def outputFilenames = processedState.collectMany{it.outputFilename}
           
           // convert state to yaml blob
           def yamlBlob_ = toTaggedYamlBlob([id: id_] + updatedState_)
 
-          [id_, yamlBlob_, yamlFilename, inputPaths, outputFilenames]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -2559,7 +2692,8 @@ def _debug(workflowArgs, debugKey) {
 def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
   def workflowArgs = processWorkflowArgs(args, defaultWfArgs, meta)
   def key_ = workflowArgs["key"]
-  
+  def multipleArgs = meta.config.allArguments.findAll{ it.multiple }.collect{it.plainName}
+
   workflow workflowInstance {
     take: input_
 
@@ -2716,12 +2850,36 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     // TODO: move some of the _meta.join_id wrangling to the safeJoin() function.
-    def chInitialOutput = chArgsWithDefaults
+    def chInitialOutputMulti = chArgsWithDefaults
       | _debug(workflowArgs, "processed")
       // run workflow
       | innerWorkflowFactory(workflowArgs)
-      // check output tuple
-      | map { id_, output_ ->
+    def chInitialOutputList = chInitialOutputMulti instanceof List ? chInitialOutputMulti : [chInitialOutputMulti]
+    assert chInitialOutputList.size() > 0: "should have emitted at least one output channel"
+    // Add a channel ID to the events, which designates the channel the event was emitted from as a running number
+    // This number is used to sort the events later when the events are gathered from across the channels.
+    def chInitialOutputListWithIndexedEvents = chInitialOutputList.withIndex().collect{channel, channelIndex ->
+      def newChannel = channel
+        | map {tuple ->
+          assert tuple instanceof List : 
+          "Error in module '${key_}': element in output channel should be a tuple [id, data, ...otherargs...]\n" +
+          "  Example: [\"id\", [input: file('foo.txt'), arg: 10]].\n" +
+          "  Expected class: List. Found: tuple.getClass() is ${tuple.getClass()}"
+        
+          def newEvent = [channelIndex] + tuple
+          return newEvent
+        }
+      return newChannel
+    }
+    // Put the events into 1 channel, cover case where there is only one channel is emitted
+    def chInitialOutput = chInitialOutputList.size() > 1 ? \
+      chInitialOutputListWithIndexedEvents[0].mix(*chInitialOutputListWithIndexedEvents.tail()) : \
+      chInitialOutputListWithIndexedEvents[0]
+    def chInitialOutputProcessed = chInitialOutput
+      | map { tuple  ->
+        def channelId = tuple[0]
+        def id_ = tuple[1]
+        def output_ = tuple[2]
 
         // see if output map contains metadata
         def meta_ =
@@ -2734,19 +2892,95 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
         output_ = output_.findAll{k, v -> k != "_meta"}
 
         // check value types
-        output_ = _processOutputValues(output_, meta.config, id_, key_)
+        output_ = _checkValidOutputArgument(output_, meta.config, id_, key_)
 
-        // simplify output if need be
-        if (workflowArgs.auto.simplifyOutput && output_.size() == 1) {
-          output_ = output_.values()[0]
-        }
-
-        [join_id, id_, output_]
+        [join_id, channelId, id_, output_]
       }
       // | view{"chInitialOutput: ${it.take(3)}"}
 
+    // join the output [prev_id, channel_id, new_id, output] with the previous state [prev_id, state, ...]
+    def chPublishWithPreviousState = safeJoin(chInitialOutputProcessed, chRunFiltered, key_)
+      // input tuple format: [join_id, channel_id, id, output, prev_state, ...]
+      // output tuple format: [join_id, channel_id, id, new_state, ...]
+      | map{ tup ->
+        def new_state = workflowArgs.toState(tup.drop(2).take(3))
+        tup.take(3) + [new_state] + tup.drop(5)
+      }
+    if (workflowArgs.auto.publish == "state") {
+      def chPublishFiles = chPublishWithPreviousState
+        // input tuple format: [join_id, channel_id, id, new_state, ...]
+        // output tuple format: [join_id, channel_id, id, new_state]
+        | map{ tup ->
+          tup.take(4)
+        }
+
+      safeJoin(chPublishFiles, chArgsWithDefaults, key_)
+        // input tuple format: [join_id, channel_id, id, new_state, orig_state, ...]
+        // output tuple format: [id, new_state, orig_state]
+        | map { tup ->
+          tup.drop(2).take(3)
+        }
+        | publishFilesByConfig(key: key_, config: meta.config)
+    }
+    // Join the state from the events that were emitted from different channels
+    def chJoined = chInitialOutputProcessed
+      | map {tuple ->
+        def join_id = tuple[0]
+        def channel_id = tuple[1]
+        def id = tuple[2]
+        def other = tuple.drop(3)
+        // Below, groupTuple is used to join the events. To make sure resuming a workflow
+        // keeps working, the output state must be deterministic. This means the state needs to be
+        // sorted with groupTuple's has a 'sort' argument. This argument can be set to 'hash',
+        // but hashing the state when it is large can be problematic in terms of performance.
+        // Therefore, a custom comparator function is provided. We add the channel ID to the 
+        // states so that we can use the channel ID to sort the items. 
+        def stateWithChannelID = [[channel_id] * other.size(), other].transpose()
+        // A comparator that is provided to groupTuple's 'sort' argument is applied
+        // to all elements of the event tuple (that is not the 'id'). The comparator
+        // closure that is used below expects the input to be List. So the join_id and
+        // channel_id must also be wrapped in a list. 
+        [[join_id], [channel_id], id] + stateWithChannelID
+      }
+      | groupTuple(by: 2, sort: {a, b -> a[0] <=> b[0]}, size: chInitialOutputList.size(), remainder: true)
+      | map {join_ids, _, id, statesWithChannelID ->
+        // Remove the channel IDs from the states
+        def states = statesWithChannelID.collect{it[1]}
+        def newJoinId = join_ids.flatten().unique{a, b -> a <=> b}
+        assert newJoinId.size() == 1: "Multiple events were emitted for '$id'."
+        def newJoinIdUnique = newJoinId[0]
+        def newState = states.inject([:]){ old_state, state_to_add ->
+          def stateToAddNoMultiple = state_to_add.findAll{k, v -> !multipleArgs.contains(k)}
+          // First add non multiple arguments
+
+          def overlap = old_state.keySet().intersect(stateToAddNoMultiple.keySet())
+          assert overlap.isEmpty() : "ID $id: multiple entries for " + 
+            " argument(s) $overlap were emitted."
+          def return_state = old_state + stateToAddNoMultiple
+
+          // Add `multiple: true` arguments
+          def stateToAddMultiple = state_to_add.findAll{k, v -> multipleArgs.contains(k)}
+          stateToAddMultiple.each {k, v ->
+            def currentKey = return_state.getOrDefault(k, [])
+            def currentKeyList = currentKey instanceof List ? currentKey : [currentKey]
+            currentKeyList.add(v)
+            return_state[k] = currentKeyList
+          }
+          return return_state
+        }
+
+        _checkAllRequiredOuputsPresent(newState, meta.config, id, key_)
+
+        // simplify output if need be
+        if (workflowArgs.auto.simplifyOutput && newState.size() == 1) {
+          newState = newState.values()[0]
+        }
+
+        return [newJoinIdUnique, id, newState]
+      }
+    
     // join the output [prev_id, new_id, output] with the previous state [prev_id, state, ...]
-    def chNewState = safeJoin(chInitialOutput, chRunFiltered, key_)
+    def chNewState = safeJoin(chJoined, chRunFiltered, key_)
       // input tuple format: [join_id, id, output, prev_state, ...]
       // output tuple format: [join_id, id, new_state, ...]
       | map{ tup ->
@@ -2755,23 +2989,21 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     if (workflowArgs.auto.publish == "state") {
-      def chPublish = chNewState
+      def chPublishStates = chNewState
         // input tuple format: [join_id, id, new_state, ...]
         // output tuple format: [join_id, id, new_state]
         | map{ tup ->
           tup.take(3)
         }
 
-      safeJoin(chPublish, chArgsWithDefaults, key_)
+      safeJoin(chPublishStates, chArgsWithDefaults, key_)
         // input tuple format: [join_id, id, new_state, orig_state, ...]
         // output tuple format: [id, new_state, orig_state]
         | map { tup ->
           tup.drop(1).take(3)
-      }
+        }
         | publishStatesByConfig(key: key_, config: meta.config)
     }
-
-    // remove join_id and meta
     chReturn = chNewState
       | map { tup ->
         // input tuple format: [join_id, id, new_state, ...]
@@ -2863,6 +3095,10 @@ meta = [
     }
   ],
   "status" : "enabled",
+  "scope" : {
+    "image" : "public",
+    "target" : "public"
+  },
   "requirements" : {
     "commands" : [
       "ps"
@@ -2984,10 +3220,10 @@ meta = [
     "runner" : "nextflow",
     "engine" : "docker|native",
     "output" : "target/nextflow/io/interop_summary_to_csv",
-    "viash_version" : "0.9.0",
-    "git_commit" : "d7d3b3e1de64f07a8b161b68a60098103ff691fb",
-    "git_remote" : "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex",
-    "git_tag" : "v0.1.1-14-gd7d3b3e"
+    "viash_version" : "0.9.1",
+    "git_commit" : "8da2bf20c5727df1fcdcc997ae87caf562ac4983",
+    "git_remote" : "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex",
+    "git_tag" : "v0.1.1-15-g8da2bf2"
   },
   "package_config" : {
     "name" : "demultiplex",
@@ -3001,7 +3237,7 @@ meta = [
         }
       ]
     },
-    "viash_version" : "0.9.0",
+    "viash_version" : "0.9.1",
     "source" : "src",
     "target" : "target",
     "config_mods" : [
diff --git a/target/nextflow/io/publish/.config.vsh.yaml b/target/nextflow/io/publish/.config.vsh.yaml
index 13c592b..7c9e2f9 100644
--- a/target/nextflow/io/publish/.config.vsh.yaml
+++ b/target/nextflow/io/publish/.config.vsh.yaml
@@ -100,6 +100,9 @@ resources:
 description: "Publish the processed results of the run"
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -195,10 +198,10 @@ build_info:
   engine: "docker|native"
   output: "target/nextflow/io/publish"
   executable: "target/nextflow/io/publish/main.nf"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -207,7 +210,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/nextflow/io/publish/main.nf b/target/nextflow/io/publish/main.nf
index 64c3d16..d4d1769 100644
--- a/target/nextflow/io/publish/main.nf
+++ b/target/nextflow/io/publish/main.nf
@@ -1,6 +1,6 @@
 // publish main
 // 
-// This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+// This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 // work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 // Intuitive.
 // 
@@ -173,7 +173,7 @@ def _checkArgumentType(String stage, Map par, Object value, String errorIdentifi
 Map _processInputValues(Map inputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
     config.allArguments.each { arg ->
-      if (arg.required) {
+      if (arg.required && arg.direction == "input") {
         assert inputs.containsKey(arg.plainName) && inputs.get(arg.plainName) != null : 
           "Error in module '${key}' id '${id}': required input argument '${arg.plainName}' is missing"
       }
@@ -192,15 +192,8 @@ Map _processInputValues(Map inputs, Map config, String id, String key) {
 }
 
 // helper file: 'src/main/resources/io/viash/runners/nextflow/arguments/_processOutputValues.nf'
-Map _processOutputValues(Map outputs, Map config, String id, String key) {
+Map _checkValidOutputArgument(Map outputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
-    config.allArguments.each { arg ->
-      if (arg.direction == "output" && arg.required) {
-        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
-          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
-      }
-    }
-
     outputs = outputs.collectEntries { name, value ->
       def par = config.allArguments.find { it.plainName == name && it.direction == "output" }
       assert par != null : "Error in module '${key}' id '${id}': '${name}' is not a valid output argument"
@@ -213,6 +206,16 @@ Map _processOutputValues(Map outputs, Map config, String id, String key) {
   return outputs
 }
 
+void _checkAllRequiredOuputsPresent(Map outputs, Map config, String id, String key) {
+  if (!workflow.stubRun) {
+    config.allArguments.each { arg ->
+      if (arg.direction == "output" && arg.required) {
+        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
+          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
+      }
+    }
+  }
+}
 // helper file: 'src/main/resources/io/viash/runners/nextflow/channel/IDChecker.nf'
 class IDChecker {
   final def items = [] as Set
@@ -1666,6 +1669,162 @@ def joinStates(Closure apply_) {
   }
   return joinStatesWf
 }
+// helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishFiles.nf'
+def publishFiles(Map args) {
+  def key_ = args.get("key")
+
+  assert key_ != null : "publishFiles: key must be specified"
+  
+  workflow publishFilesWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1]
+
+          // the input files and the target output filenames
+          def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
+          def inputFiles_ = inputoutputFilenames_[0]
+          def outputFilenames_ = inputoutputFilenames_[1]
+
+          [id_, inputFiles_, outputFilenames_]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesWf
+}
+
+process publishFilesProc {
+  // todo: check publishpath?
+  publishDir path: "${getPublishDir()}/", mode: "copy"
+  tag "$id"
+  input:
+    tuple val(id), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+  output:
+    tuple val(id), path{outputFiles}
+  script:
+  def copyCommands = [
+    inputFiles instanceof List ? inputFiles : [inputFiles],
+    outputFiles instanceof List ? outputFiles : [outputFiles]
+  ]
+    .transpose()
+    .collectMany{infile, outfile ->
+      if (infile.toString() != outfile.toString()) {
+        [
+          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
+          "cp -r '${infile.toString()}' '${outfile.toString()}'"
+        ]
+      } else {
+        // no need to copy if infile is the same as outfile
+        []
+      }
+    }
+  """
+  echo "Copying output files to destination folder"
+  ${copyCommands.join("\n  ")}
+  """
+}
+
+
+// this assumes that the state contains no other values other than those specified in the config
+def publishFilesByConfig(Map args) {
+  def config = args.get("config")
+  assert config != null : "publishFilesByConfig: config must be specified"
+
+  def key_ = args.get("key", config.name)
+  assert key_ != null : "publishFilesByConfig: key must be specified"
+  
+  workflow publishFilesSimpleWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1] // e.g. [output: new File("myoutput.h5ad"), k: 10]
+          def origState_ = tup[2] // e.g. [output: '$id.$key.foo.h5ad']
+
+
+          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          //   - key is a String
+          //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
+          //   - inputPath is a List[Path]
+          //   - outputFilename is a List[String]
+          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
+          def processedState =
+            config.allArguments
+              .findAll { it.direction == "output" }
+              .collectMany { par ->
+                def plainName_ = par.plainName
+                // if the state does not contain the key, it's an
+                // optional argument for which the component did 
+                // not generate any output OR multiple channels were emitted
+                // and the output was just not added to using the channel
+                // that is now being parsed
+                if (!state_.containsKey(plainName_)) {
+                  return []
+                }
+                def value = state_[plainName_]
+                // if the parameter is not a file, it should be stored
+                // in the state as-is, but is not something that needs 
+                // to be copied from the source path to the dest path
+                if (par.type != "file") {
+                  return [[inputPath: [], outputFilename: []]]
+                }
+                // if the orig state does not contain this filename,
+                // it's an optional argument for which the user specified
+                // that it should not be returned as a state
+                if (!origState_.containsKey(plainName_)) {
+                  return []
+                }
+                def filenameTemplate = origState_[plainName_]
+                // if the pararameter is multiple: true, fetch the template
+                if (par.multiple && filenameTemplate instanceof List) {
+                  filenameTemplate = filenameTemplate[0]
+                }
+                // instantiate the template
+                def filename = filenameTemplate
+                  .replaceAll('\\$id', id_)
+                  .replaceAll('\\$\\{id\\}', id_)
+                  .replaceAll('\\$key', key_)
+                  .replaceAll('\\$\\{key\\}', key_)
+                if (par.multiple) {
+                  // if the parameter is multiple: true, the filename
+                  // should contain a wildcard '*' that is replaced with
+                  // the index of the file
+                  assert filename.contains("*") : "Module '${key_}' id '${id_}': Multiple output files specified, but no wildcard '*' in the filename: ${filename}"
+                  def outputPerFile = value.withIndex().collect{ val, ix ->
+                    def filename_ix = filename.replace("*", ix.toString())
+                    def inputPath = val instanceof File ? val.toPath() : val
+                    [inputPath: inputPath, outputFilename: filename_ix]
+                  }
+                  def transposedOutputs = ["inputPath", "outputFilename"].collectEntries{ key -> 
+                    [key, outputPerFile.collect{dic -> dic[key]}]
+                  }
+                  return [[key: plainName_] + transposedOutputs]
+                } else {
+                  def value_ = java.nio.file.Paths.get(filename)
+                  def inputPath = value instanceof File ? value.toPath() : value
+                  return [[inputPath: [inputPath], outputFilename: [filename]]]
+                }
+              }
+          
+          def inputPaths = processedState.collectMany{it.inputPath}
+          def outputFilenames = processedState.collectMany{it.outputFilename}
+          
+
+          [id_, inputPaths, outputFilenames]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesSimpleWf
+}
+
+
+
+
 // helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishStates.nf'
 def collectFiles(obj) {
   if (obj instanceof java.io.File || obj instanceof Path)  {
@@ -1723,8 +1882,6 @@ def publishStates(Map args) {
 
           // the input files and the target output filenames
           def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
-          def inputFiles_ = inputoutputFilenames_[0]
-          def outputFilenames_ = inputoutputFilenames_[1]
 
           def yamlFilename = yamlTemplate_
             .replaceAll('\\$id', id_)
@@ -1737,7 +1894,7 @@ def publishStates(Map args) {
           // convert state to yaml blob
           def yamlBlob_ = toRelativeTaggedYamlBlob([id: id_] + state_, java.nio.file.Paths.get(yamlFilename))
 
-          [id_, yamlBlob_, yamlFilename, inputFiles_, outputFilenames_]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -1749,33 +1906,17 @@ process publishStatesProc {
   publishDir path: "${getPublishDir()}/", mode: "copy"
   tag "$id"
   input:
-    tuple val(id), val(yamlBlob), val(yamlFile), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+    tuple val(id), val(yamlBlob), val(yamlFile)
   output:
-    tuple val(id), path{[yamlFile] + outputFiles}
+    tuple val(id), path{[yamlFile]}
   script:
-  def copyCommands = [
-    inputFiles instanceof List ? inputFiles : [inputFiles],
-    outputFiles instanceof List ? outputFiles : [outputFiles]
-  ]
-    .transpose()
-    .collectMany{infile, outfile ->
-      if (infile.toString() != outfile.toString()) {
-        [
-          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
-          "cp -r '${infile.toString()}' '${outfile.toString()}'"
-        ]
-      } else {
-        // no need to copy if infile is the same as outfile
-        []
-      }
-    }
   """
-mkdir -p "\$(dirname '${yamlFile}')"
-echo "Storing state as yaml"
-echo '${yamlBlob}' > '${yamlFile}'
-echo "Copying output files to destination folder"
-${copyCommands.join("\n  ")}
-"""
+  mkdir -p "\$(dirname '${yamlFile}')"
+  echo "Storing state as yaml"
+  cat > '${yamlFile}' << HERE
+${yamlBlob}
+HERE
+  """
 }
 
 
@@ -1806,13 +1947,10 @@ def publishStatesByConfig(Map args) {
             .replaceAll('\\$\\{key\\}', key_)
           def yamlDir = java.nio.file.Paths.get(yamlFilename).getParent()
 
-          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          // the processed state is a list of [key, value] tuples, where
           //   - key is a String
           //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
-          //   - inputPath is a List[Path]
-          //   - outputFilename is a List[String]
           //   - (key, value) are the tuples that will be saved to the state.yaml file
-          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
           def processedState =
             config.allArguments
               .findAll { it.direction == "output" }
@@ -1829,7 +1967,7 @@ def publishStatesByConfig(Map args) {
                 // in the state as-is, but is not something that needs 
                 // to be copied from the source path to the dest path
                 if (par.type != "file") {
-                  return [[key: plainName_, value: value, inputPath: [], outputFilename: []]]
+                  return [[key: plainName_, value: value]]
                 }
                 // if the orig state does not contain this filename,
                 // it's an optional argument for which the user specified
@@ -1860,13 +1998,9 @@ def publishStatesByConfig(Map args) {
                     if (yamlDir != null) {
                       value_ = yamlDir.relativize(value_)
                     }
-                    def inputPath = val instanceof File ? val.toPath() : val
-                    [value: value_, inputPath: inputPath, outputFilename: filename_ix]
+                    return value_
                   }
-                  def transposedOutputs = ["value", "inputPath", "outputFilename"].collectEntries{ key -> 
-                    [key, outputPerFile.collect{dic -> dic[key]}]
-                  }
-                  return [[key: plainName_] + transposedOutputs]
+                  return [["key": plainName_, "value": outputPerFile]]
                 } else {
                   def value_ = java.nio.file.Paths.get(filename)
                   // if id contains a slash
@@ -1874,18 +2008,17 @@ def publishStatesByConfig(Map args) {
                     value_ = yamlDir.relativize(value_)
                   }
                   def inputPath = value instanceof File ? value.toPath() : value
-                  return [[key: plainName_, value: value_, inputPath: [inputPath], outputFilename: [filename]]]
+                  return [["key": plainName_, value: value_]]
                 }
               }
+              
           
           def updatedState_ = processedState.collectEntries{[it.key, it.value]}
-          def inputPaths = processedState.collectMany{it.inputPath}
-          def outputFilenames = processedState.collectMany{it.outputFilename}
           
           // convert state to yaml blob
           def yamlBlob_ = toTaggedYamlBlob([id: id_] + updatedState_)
 
-          [id_, yamlBlob_, yamlFilename, inputPaths, outputFilenames]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -2559,7 +2692,8 @@ def _debug(workflowArgs, debugKey) {
 def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
   def workflowArgs = processWorkflowArgs(args, defaultWfArgs, meta)
   def key_ = workflowArgs["key"]
-  
+  def multipleArgs = meta.config.allArguments.findAll{ it.multiple }.collect{it.plainName}
+
   workflow workflowInstance {
     take: input_
 
@@ -2716,12 +2850,36 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     // TODO: move some of the _meta.join_id wrangling to the safeJoin() function.
-    def chInitialOutput = chArgsWithDefaults
+    def chInitialOutputMulti = chArgsWithDefaults
       | _debug(workflowArgs, "processed")
       // run workflow
       | innerWorkflowFactory(workflowArgs)
-      // check output tuple
-      | map { id_, output_ ->
+    def chInitialOutputList = chInitialOutputMulti instanceof List ? chInitialOutputMulti : [chInitialOutputMulti]
+    assert chInitialOutputList.size() > 0: "should have emitted at least one output channel"
+    // Add a channel ID to the events, which designates the channel the event was emitted from as a running number
+    // This number is used to sort the events later when the events are gathered from across the channels.
+    def chInitialOutputListWithIndexedEvents = chInitialOutputList.withIndex().collect{channel, channelIndex ->
+      def newChannel = channel
+        | map {tuple ->
+          assert tuple instanceof List : 
+          "Error in module '${key_}': element in output channel should be a tuple [id, data, ...otherargs...]\n" +
+          "  Example: [\"id\", [input: file('foo.txt'), arg: 10]].\n" +
+          "  Expected class: List. Found: tuple.getClass() is ${tuple.getClass()}"
+        
+          def newEvent = [channelIndex] + tuple
+          return newEvent
+        }
+      return newChannel
+    }
+    // Put the events into 1 channel, cover case where there is only one channel is emitted
+    def chInitialOutput = chInitialOutputList.size() > 1 ? \
+      chInitialOutputListWithIndexedEvents[0].mix(*chInitialOutputListWithIndexedEvents.tail()) : \
+      chInitialOutputListWithIndexedEvents[0]
+    def chInitialOutputProcessed = chInitialOutput
+      | map { tuple  ->
+        def channelId = tuple[0]
+        def id_ = tuple[1]
+        def output_ = tuple[2]
 
         // see if output map contains metadata
         def meta_ =
@@ -2734,19 +2892,95 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
         output_ = output_.findAll{k, v -> k != "_meta"}
 
         // check value types
-        output_ = _processOutputValues(output_, meta.config, id_, key_)
+        output_ = _checkValidOutputArgument(output_, meta.config, id_, key_)
 
-        // simplify output if need be
-        if (workflowArgs.auto.simplifyOutput && output_.size() == 1) {
-          output_ = output_.values()[0]
-        }
-
-        [join_id, id_, output_]
+        [join_id, channelId, id_, output_]
       }
       // | view{"chInitialOutput: ${it.take(3)}"}
 
+    // join the output [prev_id, channel_id, new_id, output] with the previous state [prev_id, state, ...]
+    def chPublishWithPreviousState = safeJoin(chInitialOutputProcessed, chRunFiltered, key_)
+      // input tuple format: [join_id, channel_id, id, output, prev_state, ...]
+      // output tuple format: [join_id, channel_id, id, new_state, ...]
+      | map{ tup ->
+        def new_state = workflowArgs.toState(tup.drop(2).take(3))
+        tup.take(3) + [new_state] + tup.drop(5)
+      }
+    if (workflowArgs.auto.publish == "state") {
+      def chPublishFiles = chPublishWithPreviousState
+        // input tuple format: [join_id, channel_id, id, new_state, ...]
+        // output tuple format: [join_id, channel_id, id, new_state]
+        | map{ tup ->
+          tup.take(4)
+        }
+
+      safeJoin(chPublishFiles, chArgsWithDefaults, key_)
+        // input tuple format: [join_id, channel_id, id, new_state, orig_state, ...]
+        // output tuple format: [id, new_state, orig_state]
+        | map { tup ->
+          tup.drop(2).take(3)
+        }
+        | publishFilesByConfig(key: key_, config: meta.config)
+    }
+    // Join the state from the events that were emitted from different channels
+    def chJoined = chInitialOutputProcessed
+      | map {tuple ->
+        def join_id = tuple[0]
+        def channel_id = tuple[1]
+        def id = tuple[2]
+        def other = tuple.drop(3)
+        // Below, groupTuple is used to join the events. To make sure resuming a workflow
+        // keeps working, the output state must be deterministic. This means the state needs to be
+        // sorted with groupTuple's has a 'sort' argument. This argument can be set to 'hash',
+        // but hashing the state when it is large can be problematic in terms of performance.
+        // Therefore, a custom comparator function is provided. We add the channel ID to the 
+        // states so that we can use the channel ID to sort the items. 
+        def stateWithChannelID = [[channel_id] * other.size(), other].transpose()
+        // A comparator that is provided to groupTuple's 'sort' argument is applied
+        // to all elements of the event tuple (that is not the 'id'). The comparator
+        // closure that is used below expects the input to be List. So the join_id and
+        // channel_id must also be wrapped in a list. 
+        [[join_id], [channel_id], id] + stateWithChannelID
+      }
+      | groupTuple(by: 2, sort: {a, b -> a[0] <=> b[0]}, size: chInitialOutputList.size(), remainder: true)
+      | map {join_ids, _, id, statesWithChannelID ->
+        // Remove the channel IDs from the states
+        def states = statesWithChannelID.collect{it[1]}
+        def newJoinId = join_ids.flatten().unique{a, b -> a <=> b}
+        assert newJoinId.size() == 1: "Multiple events were emitted for '$id'."
+        def newJoinIdUnique = newJoinId[0]
+        def newState = states.inject([:]){ old_state, state_to_add ->
+          def stateToAddNoMultiple = state_to_add.findAll{k, v -> !multipleArgs.contains(k)}
+          // First add non multiple arguments
+
+          def overlap = old_state.keySet().intersect(stateToAddNoMultiple.keySet())
+          assert overlap.isEmpty() : "ID $id: multiple entries for " + 
+            " argument(s) $overlap were emitted."
+          def return_state = old_state + stateToAddNoMultiple
+
+          // Add `multiple: true` arguments
+          def stateToAddMultiple = state_to_add.findAll{k, v -> multipleArgs.contains(k)}
+          stateToAddMultiple.each {k, v ->
+            def currentKey = return_state.getOrDefault(k, [])
+            def currentKeyList = currentKey instanceof List ? currentKey : [currentKey]
+            currentKeyList.add(v)
+            return_state[k] = currentKeyList
+          }
+          return return_state
+        }
+
+        _checkAllRequiredOuputsPresent(newState, meta.config, id, key_)
+
+        // simplify output if need be
+        if (workflowArgs.auto.simplifyOutput && newState.size() == 1) {
+          newState = newState.values()[0]
+        }
+
+        return [newJoinIdUnique, id, newState]
+      }
+    
     // join the output [prev_id, new_id, output] with the previous state [prev_id, state, ...]
-    def chNewState = safeJoin(chInitialOutput, chRunFiltered, key_)
+    def chNewState = safeJoin(chJoined, chRunFiltered, key_)
       // input tuple format: [join_id, id, output, prev_state, ...]
       // output tuple format: [join_id, id, new_state, ...]
       | map{ tup ->
@@ -2755,23 +2989,21 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     if (workflowArgs.auto.publish == "state") {
-      def chPublish = chNewState
+      def chPublishStates = chNewState
         // input tuple format: [join_id, id, new_state, ...]
         // output tuple format: [join_id, id, new_state]
         | map{ tup ->
           tup.take(3)
         }
 
-      safeJoin(chPublish, chArgsWithDefaults, key_)
+      safeJoin(chPublishStates, chArgsWithDefaults, key_)
         // input tuple format: [join_id, id, new_state, orig_state, ...]
         // output tuple format: [id, new_state, orig_state]
         | map { tup ->
           tup.drop(1).take(3)
-      }
+        }
         | publishStatesByConfig(key: key_, config: meta.config)
     }
-
-    // remove join_id and meta
     chReturn = chNewState
       | map { tup ->
         // input tuple format: [join_id, id, new_state, ...]
@@ -2929,6 +3161,10 @@ meta = [
   ],
   "description" : "Publish the processed results of the run",
   "status" : "enabled",
+  "scope" : {
+    "image" : "public",
+    "target" : "public"
+  },
   "requirements" : {
     "commands" : [
       "ps"
@@ -3043,10 +3279,10 @@ meta = [
     "runner" : "nextflow",
     "engine" : "docker|native",
     "output" : "target/nextflow/io/publish",
-    "viash_version" : "0.9.0",
-    "git_commit" : "d7d3b3e1de64f07a8b161b68a60098103ff691fb",
-    "git_remote" : "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex",
-    "git_tag" : "v0.1.1-14-gd7d3b3e"
+    "viash_version" : "0.9.1",
+    "git_commit" : "8da2bf20c5727df1fcdcc997ae87caf562ac4983",
+    "git_remote" : "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex",
+    "git_tag" : "v0.1.1-15-g8da2bf2"
   },
   "package_config" : {
     "name" : "demultiplex",
@@ -3060,7 +3296,7 @@ meta = [
         }
       ]
     },
-    "viash_version" : "0.9.0",
+    "viash_version" : "0.9.1",
     "source" : "src",
     "target" : "target",
     "config_mods" : [
diff --git a/target/nextflow/io/untar/.config.vsh.yaml b/target/nextflow/io/untar/.config.vsh.yaml
index c6091d8..fc97288 100644
--- a/target/nextflow/io/untar/.config.vsh.yaml
+++ b/target/nextflow/io/untar/.config.vsh.yaml
@@ -57,6 +57,9 @@ test_resources:
   is_executable: true
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -152,10 +155,10 @@ build_info:
   engine: "docker|native"
   output: "target/nextflow/io/untar"
   executable: "target/nextflow/io/untar/main.nf"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
 package_config:
   name: "demultiplex"
   version: "main"
@@ -164,7 +167,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/nextflow/io/untar/main.nf b/target/nextflow/io/untar/main.nf
index 013cc9d..ebbdb43 100644
--- a/target/nextflow/io/untar/main.nf
+++ b/target/nextflow/io/untar/main.nf
@@ -1,6 +1,6 @@
 // untar main
 // 
-// This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+// This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 // work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 // Intuitive.
 // 
@@ -173,7 +173,7 @@ def _checkArgumentType(String stage, Map par, Object value, String errorIdentifi
 Map _processInputValues(Map inputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
     config.allArguments.each { arg ->
-      if (arg.required) {
+      if (arg.required && arg.direction == "input") {
         assert inputs.containsKey(arg.plainName) && inputs.get(arg.plainName) != null : 
           "Error in module '${key}' id '${id}': required input argument '${arg.plainName}' is missing"
       }
@@ -192,15 +192,8 @@ Map _processInputValues(Map inputs, Map config, String id, String key) {
 }
 
 // helper file: 'src/main/resources/io/viash/runners/nextflow/arguments/_processOutputValues.nf'
-Map _processOutputValues(Map outputs, Map config, String id, String key) {
+Map _checkValidOutputArgument(Map outputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
-    config.allArguments.each { arg ->
-      if (arg.direction == "output" && arg.required) {
-        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
-          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
-      }
-    }
-
     outputs = outputs.collectEntries { name, value ->
       def par = config.allArguments.find { it.plainName == name && it.direction == "output" }
       assert par != null : "Error in module '${key}' id '${id}': '${name}' is not a valid output argument"
@@ -213,6 +206,16 @@ Map _processOutputValues(Map outputs, Map config, String id, String key) {
   return outputs
 }
 
+void _checkAllRequiredOuputsPresent(Map outputs, Map config, String id, String key) {
+  if (!workflow.stubRun) {
+    config.allArguments.each { arg ->
+      if (arg.direction == "output" && arg.required) {
+        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
+          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
+      }
+    }
+  }
+}
 // helper file: 'src/main/resources/io/viash/runners/nextflow/channel/IDChecker.nf'
 class IDChecker {
   final def items = [] as Set
@@ -1666,6 +1669,162 @@ def joinStates(Closure apply_) {
   }
   return joinStatesWf
 }
+// helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishFiles.nf'
+def publishFiles(Map args) {
+  def key_ = args.get("key")
+
+  assert key_ != null : "publishFiles: key must be specified"
+  
+  workflow publishFilesWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1]
+
+          // the input files and the target output filenames
+          def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
+          def inputFiles_ = inputoutputFilenames_[0]
+          def outputFilenames_ = inputoutputFilenames_[1]
+
+          [id_, inputFiles_, outputFilenames_]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesWf
+}
+
+process publishFilesProc {
+  // todo: check publishpath?
+  publishDir path: "${getPublishDir()}/", mode: "copy"
+  tag "$id"
+  input:
+    tuple val(id), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+  output:
+    tuple val(id), path{outputFiles}
+  script:
+  def copyCommands = [
+    inputFiles instanceof List ? inputFiles : [inputFiles],
+    outputFiles instanceof List ? outputFiles : [outputFiles]
+  ]
+    .transpose()
+    .collectMany{infile, outfile ->
+      if (infile.toString() != outfile.toString()) {
+        [
+          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
+          "cp -r '${infile.toString()}' '${outfile.toString()}'"
+        ]
+      } else {
+        // no need to copy if infile is the same as outfile
+        []
+      }
+    }
+  """
+  echo "Copying output files to destination folder"
+  ${copyCommands.join("\n  ")}
+  """
+}
+
+
+// this assumes that the state contains no other values other than those specified in the config
+def publishFilesByConfig(Map args) {
+  def config = args.get("config")
+  assert config != null : "publishFilesByConfig: config must be specified"
+
+  def key_ = args.get("key", config.name)
+  assert key_ != null : "publishFilesByConfig: key must be specified"
+  
+  workflow publishFilesSimpleWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1] // e.g. [output: new File("myoutput.h5ad"), k: 10]
+          def origState_ = tup[2] // e.g. [output: '$id.$key.foo.h5ad']
+
+
+          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          //   - key is a String
+          //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
+          //   - inputPath is a List[Path]
+          //   - outputFilename is a List[String]
+          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
+          def processedState =
+            config.allArguments
+              .findAll { it.direction == "output" }
+              .collectMany { par ->
+                def plainName_ = par.plainName
+                // if the state does not contain the key, it's an
+                // optional argument for which the component did 
+                // not generate any output OR multiple channels were emitted
+                // and the output was just not added to using the channel
+                // that is now being parsed
+                if (!state_.containsKey(plainName_)) {
+                  return []
+                }
+                def value = state_[plainName_]
+                // if the parameter is not a file, it should be stored
+                // in the state as-is, but is not something that needs 
+                // to be copied from the source path to the dest path
+                if (par.type != "file") {
+                  return [[inputPath: [], outputFilename: []]]
+                }
+                // if the orig state does not contain this filename,
+                // it's an optional argument for which the user specified
+                // that it should not be returned as a state
+                if (!origState_.containsKey(plainName_)) {
+                  return []
+                }
+                def filenameTemplate = origState_[plainName_]
+                // if the pararameter is multiple: true, fetch the template
+                if (par.multiple && filenameTemplate instanceof List) {
+                  filenameTemplate = filenameTemplate[0]
+                }
+                // instantiate the template
+                def filename = filenameTemplate
+                  .replaceAll('\\$id', id_)
+                  .replaceAll('\\$\\{id\\}', id_)
+                  .replaceAll('\\$key', key_)
+                  .replaceAll('\\$\\{key\\}', key_)
+                if (par.multiple) {
+                  // if the parameter is multiple: true, the filename
+                  // should contain a wildcard '*' that is replaced with
+                  // the index of the file
+                  assert filename.contains("*") : "Module '${key_}' id '${id_}': Multiple output files specified, but no wildcard '*' in the filename: ${filename}"
+                  def outputPerFile = value.withIndex().collect{ val, ix ->
+                    def filename_ix = filename.replace("*", ix.toString())
+                    def inputPath = val instanceof File ? val.toPath() : val
+                    [inputPath: inputPath, outputFilename: filename_ix]
+                  }
+                  def transposedOutputs = ["inputPath", "outputFilename"].collectEntries{ key -> 
+                    [key, outputPerFile.collect{dic -> dic[key]}]
+                  }
+                  return [[key: plainName_] + transposedOutputs]
+                } else {
+                  def value_ = java.nio.file.Paths.get(filename)
+                  def inputPath = value instanceof File ? value.toPath() : value
+                  return [[inputPath: [inputPath], outputFilename: [filename]]]
+                }
+              }
+          
+          def inputPaths = processedState.collectMany{it.inputPath}
+          def outputFilenames = processedState.collectMany{it.outputFilename}
+          
+
+          [id_, inputPaths, outputFilenames]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesSimpleWf
+}
+
+
+
+
 // helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishStates.nf'
 def collectFiles(obj) {
   if (obj instanceof java.io.File || obj instanceof Path)  {
@@ -1723,8 +1882,6 @@ def publishStates(Map args) {
 
           // the input files and the target output filenames
           def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
-          def inputFiles_ = inputoutputFilenames_[0]
-          def outputFilenames_ = inputoutputFilenames_[1]
 
           def yamlFilename = yamlTemplate_
             .replaceAll('\\$id', id_)
@@ -1737,7 +1894,7 @@ def publishStates(Map args) {
           // convert state to yaml blob
           def yamlBlob_ = toRelativeTaggedYamlBlob([id: id_] + state_, java.nio.file.Paths.get(yamlFilename))
 
-          [id_, yamlBlob_, yamlFilename, inputFiles_, outputFilenames_]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -1749,33 +1906,17 @@ process publishStatesProc {
   publishDir path: "${getPublishDir()}/", mode: "copy"
   tag "$id"
   input:
-    tuple val(id), val(yamlBlob), val(yamlFile), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+    tuple val(id), val(yamlBlob), val(yamlFile)
   output:
-    tuple val(id), path{[yamlFile] + outputFiles}
+    tuple val(id), path{[yamlFile]}
   script:
-  def copyCommands = [
-    inputFiles instanceof List ? inputFiles : [inputFiles],
-    outputFiles instanceof List ? outputFiles : [outputFiles]
-  ]
-    .transpose()
-    .collectMany{infile, outfile ->
-      if (infile.toString() != outfile.toString()) {
-        [
-          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
-          "cp -r '${infile.toString()}' '${outfile.toString()}'"
-        ]
-      } else {
-        // no need to copy if infile is the same as outfile
-        []
-      }
-    }
   """
-mkdir -p "\$(dirname '${yamlFile}')"
-echo "Storing state as yaml"
-echo '${yamlBlob}' > '${yamlFile}'
-echo "Copying output files to destination folder"
-${copyCommands.join("\n  ")}
-"""
+  mkdir -p "\$(dirname '${yamlFile}')"
+  echo "Storing state as yaml"
+  cat > '${yamlFile}' << HERE
+${yamlBlob}
+HERE
+  """
 }
 
 
@@ -1806,13 +1947,10 @@ def publishStatesByConfig(Map args) {
             .replaceAll('\\$\\{key\\}', key_)
           def yamlDir = java.nio.file.Paths.get(yamlFilename).getParent()
 
-          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          // the processed state is a list of [key, value] tuples, where
           //   - key is a String
           //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
-          //   - inputPath is a List[Path]
-          //   - outputFilename is a List[String]
           //   - (key, value) are the tuples that will be saved to the state.yaml file
-          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
           def processedState =
             config.allArguments
               .findAll { it.direction == "output" }
@@ -1829,7 +1967,7 @@ def publishStatesByConfig(Map args) {
                 // in the state as-is, but is not something that needs 
                 // to be copied from the source path to the dest path
                 if (par.type != "file") {
-                  return [[key: plainName_, value: value, inputPath: [], outputFilename: []]]
+                  return [[key: plainName_, value: value]]
                 }
                 // if the orig state does not contain this filename,
                 // it's an optional argument for which the user specified
@@ -1860,13 +1998,9 @@ def publishStatesByConfig(Map args) {
                     if (yamlDir != null) {
                       value_ = yamlDir.relativize(value_)
                     }
-                    def inputPath = val instanceof File ? val.toPath() : val
-                    [value: value_, inputPath: inputPath, outputFilename: filename_ix]
+                    return value_
                   }
-                  def transposedOutputs = ["value", "inputPath", "outputFilename"].collectEntries{ key -> 
-                    [key, outputPerFile.collect{dic -> dic[key]}]
-                  }
-                  return [[key: plainName_] + transposedOutputs]
+                  return [["key": plainName_, "value": outputPerFile]]
                 } else {
                   def value_ = java.nio.file.Paths.get(filename)
                   // if id contains a slash
@@ -1874,18 +2008,17 @@ def publishStatesByConfig(Map args) {
                     value_ = yamlDir.relativize(value_)
                   }
                   def inputPath = value instanceof File ? value.toPath() : value
-                  return [[key: plainName_, value: value_, inputPath: [inputPath], outputFilename: [filename]]]
+                  return [["key": plainName_, value: value_]]
                 }
               }
+              
           
           def updatedState_ = processedState.collectEntries{[it.key, it.value]}
-          def inputPaths = processedState.collectMany{it.inputPath}
-          def outputFilenames = processedState.collectMany{it.outputFilename}
           
           // convert state to yaml blob
           def yamlBlob_ = toTaggedYamlBlob([id: id_] + updatedState_)
 
-          [id_, yamlBlob_, yamlFilename, inputPaths, outputFilenames]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -2559,7 +2692,8 @@ def _debug(workflowArgs, debugKey) {
 def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
   def workflowArgs = processWorkflowArgs(args, defaultWfArgs, meta)
   def key_ = workflowArgs["key"]
-  
+  def multipleArgs = meta.config.allArguments.findAll{ it.multiple }.collect{it.plainName}
+
   workflow workflowInstance {
     take: input_
 
@@ -2716,12 +2850,36 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     // TODO: move some of the _meta.join_id wrangling to the safeJoin() function.
-    def chInitialOutput = chArgsWithDefaults
+    def chInitialOutputMulti = chArgsWithDefaults
       | _debug(workflowArgs, "processed")
       // run workflow
       | innerWorkflowFactory(workflowArgs)
-      // check output tuple
-      | map { id_, output_ ->
+    def chInitialOutputList = chInitialOutputMulti instanceof List ? chInitialOutputMulti : [chInitialOutputMulti]
+    assert chInitialOutputList.size() > 0: "should have emitted at least one output channel"
+    // Add a channel ID to the events, which designates the channel the event was emitted from as a running number
+    // This number is used to sort the events later when the events are gathered from across the channels.
+    def chInitialOutputListWithIndexedEvents = chInitialOutputList.withIndex().collect{channel, channelIndex ->
+      def newChannel = channel
+        | map {tuple ->
+          assert tuple instanceof List : 
+          "Error in module '${key_}': element in output channel should be a tuple [id, data, ...otherargs...]\n" +
+          "  Example: [\"id\", [input: file('foo.txt'), arg: 10]].\n" +
+          "  Expected class: List. Found: tuple.getClass() is ${tuple.getClass()}"
+        
+          def newEvent = [channelIndex] + tuple
+          return newEvent
+        }
+      return newChannel
+    }
+    // Put the events into 1 channel, cover case where there is only one channel is emitted
+    def chInitialOutput = chInitialOutputList.size() > 1 ? \
+      chInitialOutputListWithIndexedEvents[0].mix(*chInitialOutputListWithIndexedEvents.tail()) : \
+      chInitialOutputListWithIndexedEvents[0]
+    def chInitialOutputProcessed = chInitialOutput
+      | map { tuple  ->
+        def channelId = tuple[0]
+        def id_ = tuple[1]
+        def output_ = tuple[2]
 
         // see if output map contains metadata
         def meta_ =
@@ -2734,19 +2892,95 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
         output_ = output_.findAll{k, v -> k != "_meta"}
 
         // check value types
-        output_ = _processOutputValues(output_, meta.config, id_, key_)
+        output_ = _checkValidOutputArgument(output_, meta.config, id_, key_)
 
-        // simplify output if need be
-        if (workflowArgs.auto.simplifyOutput && output_.size() == 1) {
-          output_ = output_.values()[0]
-        }
-
-        [join_id, id_, output_]
+        [join_id, channelId, id_, output_]
       }
       // | view{"chInitialOutput: ${it.take(3)}"}
 
+    // join the output [prev_id, channel_id, new_id, output] with the previous state [prev_id, state, ...]
+    def chPublishWithPreviousState = safeJoin(chInitialOutputProcessed, chRunFiltered, key_)
+      // input tuple format: [join_id, channel_id, id, output, prev_state, ...]
+      // output tuple format: [join_id, channel_id, id, new_state, ...]
+      | map{ tup ->
+        def new_state = workflowArgs.toState(tup.drop(2).take(3))
+        tup.take(3) + [new_state] + tup.drop(5)
+      }
+    if (workflowArgs.auto.publish == "state") {
+      def chPublishFiles = chPublishWithPreviousState
+        // input tuple format: [join_id, channel_id, id, new_state, ...]
+        // output tuple format: [join_id, channel_id, id, new_state]
+        | map{ tup ->
+          tup.take(4)
+        }
+
+      safeJoin(chPublishFiles, chArgsWithDefaults, key_)
+        // input tuple format: [join_id, channel_id, id, new_state, orig_state, ...]
+        // output tuple format: [id, new_state, orig_state]
+        | map { tup ->
+          tup.drop(2).take(3)
+        }
+        | publishFilesByConfig(key: key_, config: meta.config)
+    }
+    // Join the state from the events that were emitted from different channels
+    def chJoined = chInitialOutputProcessed
+      | map {tuple ->
+        def join_id = tuple[0]
+        def channel_id = tuple[1]
+        def id = tuple[2]
+        def other = tuple.drop(3)
+        // Below, groupTuple is used to join the events. To make sure resuming a workflow
+        // keeps working, the output state must be deterministic. This means the state needs to be
+        // sorted with groupTuple's has a 'sort' argument. This argument can be set to 'hash',
+        // but hashing the state when it is large can be problematic in terms of performance.
+        // Therefore, a custom comparator function is provided. We add the channel ID to the 
+        // states so that we can use the channel ID to sort the items. 
+        def stateWithChannelID = [[channel_id] * other.size(), other].transpose()
+        // A comparator that is provided to groupTuple's 'sort' argument is applied
+        // to all elements of the event tuple (that is not the 'id'). The comparator
+        // closure that is used below expects the input to be List. So the join_id and
+        // channel_id must also be wrapped in a list. 
+        [[join_id], [channel_id], id] + stateWithChannelID
+      }
+      | groupTuple(by: 2, sort: {a, b -> a[0] <=> b[0]}, size: chInitialOutputList.size(), remainder: true)
+      | map {join_ids, _, id, statesWithChannelID ->
+        // Remove the channel IDs from the states
+        def states = statesWithChannelID.collect{it[1]}
+        def newJoinId = join_ids.flatten().unique{a, b -> a <=> b}
+        assert newJoinId.size() == 1: "Multiple events were emitted for '$id'."
+        def newJoinIdUnique = newJoinId[0]
+        def newState = states.inject([:]){ old_state, state_to_add ->
+          def stateToAddNoMultiple = state_to_add.findAll{k, v -> !multipleArgs.contains(k)}
+          // First add non multiple arguments
+
+          def overlap = old_state.keySet().intersect(stateToAddNoMultiple.keySet())
+          assert overlap.isEmpty() : "ID $id: multiple entries for " + 
+            " argument(s) $overlap were emitted."
+          def return_state = old_state + stateToAddNoMultiple
+
+          // Add `multiple: true` arguments
+          def stateToAddMultiple = state_to_add.findAll{k, v -> multipleArgs.contains(k)}
+          stateToAddMultiple.each {k, v ->
+            def currentKey = return_state.getOrDefault(k, [])
+            def currentKeyList = currentKey instanceof List ? currentKey : [currentKey]
+            currentKeyList.add(v)
+            return_state[k] = currentKeyList
+          }
+          return return_state
+        }
+
+        _checkAllRequiredOuputsPresent(newState, meta.config, id, key_)
+
+        // simplify output if need be
+        if (workflowArgs.auto.simplifyOutput && newState.size() == 1) {
+          newState = newState.values()[0]
+        }
+
+        return [newJoinIdUnique, id, newState]
+      }
+    
     // join the output [prev_id, new_id, output] with the previous state [prev_id, state, ...]
-    def chNewState = safeJoin(chInitialOutput, chRunFiltered, key_)
+    def chNewState = safeJoin(chJoined, chRunFiltered, key_)
       // input tuple format: [join_id, id, output, prev_state, ...]
       // output tuple format: [join_id, id, new_state, ...]
       | map{ tup ->
@@ -2755,23 +2989,21 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     if (workflowArgs.auto.publish == "state") {
-      def chPublish = chNewState
+      def chPublishStates = chNewState
         // input tuple format: [join_id, id, new_state, ...]
         // output tuple format: [join_id, id, new_state]
         | map{ tup ->
           tup.take(3)
         }
 
-      safeJoin(chPublish, chArgsWithDefaults, key_)
+      safeJoin(chPublishStates, chArgsWithDefaults, key_)
         // input tuple format: [join_id, id, new_state, orig_state, ...]
         // output tuple format: [id, new_state, orig_state]
         | map { tup ->
           tup.drop(1).take(3)
-      }
+        }
         | publishStatesByConfig(key: key_, config: meta.config)
     }
-
-    // remove join_id and meta
     chReturn = chNewState
       | map { tup ->
         // input tuple format: [join_id, id, new_state, ...]
@@ -2882,6 +3114,10 @@ meta = [
     }
   ],
   "status" : "enabled",
+  "scope" : {
+    "image" : "public",
+    "target" : "public"
+  },
   "requirements" : {
     "commands" : [
       "ps"
@@ -2996,10 +3232,10 @@ meta = [
     "runner" : "nextflow",
     "engine" : "docker|native",
     "output" : "target/nextflow/io/untar",
-    "viash_version" : "0.9.0",
-    "git_commit" : "d7d3b3e1de64f07a8b161b68a60098103ff691fb",
-    "git_remote" : "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex",
-    "git_tag" : "v0.1.1-14-gd7d3b3e"
+    "viash_version" : "0.9.1",
+    "git_commit" : "8da2bf20c5727df1fcdcc997ae87caf562ac4983",
+    "git_remote" : "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex",
+    "git_tag" : "v0.1.1-15-g8da2bf2"
   },
   "package_config" : {
     "name" : "demultiplex",
@@ -3013,7 +3249,7 @@ meta = [
         }
       ]
     },
-    "viash_version" : "0.9.0",
+    "viash_version" : "0.9.1",
     "source" : "src",
     "target" : "target",
     "config_mods" : [
diff --git a/target/nextflow/runner/.config.vsh.yaml b/target/nextflow/runner/.config.vsh.yaml
index cd16be2..6683afb 100644
--- a/target/nextflow/runner/.config.vsh.yaml
+++ b/target/nextflow/runner/.config.vsh.yaml
@@ -95,6 +95,9 @@ resources:
 description: "Runner for demultiplexing of raw sequencing data"
 info: null
 status: "enabled"
+scope:
+  image: "public"
+  target: "public"
 requirements:
   commands:
   - "ps"
@@ -183,10 +186,10 @@ build_info:
   engine: "native|native"
   output: "target/nextflow/runner"
   executable: "target/nextflow/runner/main.nf"
-  viash_version: "0.9.0"
-  git_commit: "d7d3b3e1de64f07a8b161b68a60098103ff691fb"
-  git_remote: "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex"
-  git_tag: "v0.1.1-14-gd7d3b3e"
+  viash_version: "0.9.1"
+  git_commit: "8da2bf20c5727df1fcdcc997ae87caf562ac4983"
+  git_remote: "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex"
+  git_tag: "v0.1.1-15-g8da2bf2"
   dependencies:
   - "target/nextflow/demultiplex"
   - "target/nextflow/io/publish"
@@ -198,7 +201,7 @@ package_config:
     test_resources:
     - path: "gs://viash-hub-test-data/demultiplex/v2/"
       dest: "testData"
-  viash_version: "0.9.0"
+  viash_version: "0.9.1"
   source: "src"
   target: "target"
   config_mods:
diff --git a/target/nextflow/runner/main.nf b/target/nextflow/runner/main.nf
index fcdac51..133e22f 100644
--- a/target/nextflow/runner/main.nf
+++ b/target/nextflow/runner/main.nf
@@ -1,6 +1,6 @@
 // runner main
 // 
-// This wrapper script is auto-generated by viash 0.9.0 and is thus a derivative
+// This wrapper script is auto-generated by viash 0.9.1 and is thus a derivative
 // work thereof. This software comes with ABSOLUTELY NO WARRANTY from Data
 // Intuitive.
 // 
@@ -173,7 +173,7 @@ def _checkArgumentType(String stage, Map par, Object value, String errorIdentifi
 Map _processInputValues(Map inputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
     config.allArguments.each { arg ->
-      if (arg.required) {
+      if (arg.required && arg.direction == "input") {
         assert inputs.containsKey(arg.plainName) && inputs.get(arg.plainName) != null : 
           "Error in module '${key}' id '${id}': required input argument '${arg.plainName}' is missing"
       }
@@ -192,15 +192,8 @@ Map _processInputValues(Map inputs, Map config, String id, String key) {
 }
 
 // helper file: 'src/main/resources/io/viash/runners/nextflow/arguments/_processOutputValues.nf'
-Map _processOutputValues(Map outputs, Map config, String id, String key) {
+Map _checkValidOutputArgument(Map outputs, Map config, String id, String key) {
   if (!workflow.stubRun) {
-    config.allArguments.each { arg ->
-      if (arg.direction == "output" && arg.required) {
-        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
-          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
-      }
-    }
-
     outputs = outputs.collectEntries { name, value ->
       def par = config.allArguments.find { it.plainName == name && it.direction == "output" }
       assert par != null : "Error in module '${key}' id '${id}': '${name}' is not a valid output argument"
@@ -213,6 +206,16 @@ Map _processOutputValues(Map outputs, Map config, String id, String key) {
   return outputs
 }
 
+void _checkAllRequiredOuputsPresent(Map outputs, Map config, String id, String key) {
+  if (!workflow.stubRun) {
+    config.allArguments.each { arg ->
+      if (arg.direction == "output" && arg.required) {
+        assert outputs.containsKey(arg.plainName) && outputs.get(arg.plainName) != null : 
+          "Error in module '${key}' id '${id}': required output argument '${arg.plainName}' is missing"
+      }
+    }
+  }
+}
 // helper file: 'src/main/resources/io/viash/runners/nextflow/channel/IDChecker.nf'
 class IDChecker {
   final def items = [] as Set
@@ -1666,6 +1669,162 @@ def joinStates(Closure apply_) {
   }
   return joinStatesWf
 }
+// helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishFiles.nf'
+def publishFiles(Map args) {
+  def key_ = args.get("key")
+
+  assert key_ != null : "publishFiles: key must be specified"
+  
+  workflow publishFilesWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1]
+
+          // the input files and the target output filenames
+          def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
+          def inputFiles_ = inputoutputFilenames_[0]
+          def outputFilenames_ = inputoutputFilenames_[1]
+
+          [id_, inputFiles_, outputFilenames_]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesWf
+}
+
+process publishFilesProc {
+  // todo: check publishpath?
+  publishDir path: "${getPublishDir()}/", mode: "copy"
+  tag "$id"
+  input:
+    tuple val(id), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+  output:
+    tuple val(id), path{outputFiles}
+  script:
+  def copyCommands = [
+    inputFiles instanceof List ? inputFiles : [inputFiles],
+    outputFiles instanceof List ? outputFiles : [outputFiles]
+  ]
+    .transpose()
+    .collectMany{infile, outfile ->
+      if (infile.toString() != outfile.toString()) {
+        [
+          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
+          "cp -r '${infile.toString()}' '${outfile.toString()}'"
+        ]
+      } else {
+        // no need to copy if infile is the same as outfile
+        []
+      }
+    }
+  """
+  echo "Copying output files to destination folder"
+  ${copyCommands.join("\n  ")}
+  """
+}
+
+
+// this assumes that the state contains no other values other than those specified in the config
+def publishFilesByConfig(Map args) {
+  def config = args.get("config")
+  assert config != null : "publishFilesByConfig: config must be specified"
+
+  def key_ = args.get("key", config.name)
+  assert key_ != null : "publishFilesByConfig: key must be specified"
+  
+  workflow publishFilesSimpleWf {
+    take: input_ch
+    main:
+      input_ch
+        | map { tup ->
+          def id_ = tup[0]
+          def state_ = tup[1] // e.g. [output: new File("myoutput.h5ad"), k: 10]
+          def origState_ = tup[2] // e.g. [output: '$id.$key.foo.h5ad']
+
+
+          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          //   - key is a String
+          //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
+          //   - inputPath is a List[Path]
+          //   - outputFilename is a List[String]
+          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
+          def processedState =
+            config.allArguments
+              .findAll { it.direction == "output" }
+              .collectMany { par ->
+                def plainName_ = par.plainName
+                // if the state does not contain the key, it's an
+                // optional argument for which the component did 
+                // not generate any output OR multiple channels were emitted
+                // and the output was just not added to using the channel
+                // that is now being parsed
+                if (!state_.containsKey(plainName_)) {
+                  return []
+                }
+                def value = state_[plainName_]
+                // if the parameter is not a file, it should be stored
+                // in the state as-is, but is not something that needs 
+                // to be copied from the source path to the dest path
+                if (par.type != "file") {
+                  return [[inputPath: [], outputFilename: []]]
+                }
+                // if the orig state does not contain this filename,
+                // it's an optional argument for which the user specified
+                // that it should not be returned as a state
+                if (!origState_.containsKey(plainName_)) {
+                  return []
+                }
+                def filenameTemplate = origState_[plainName_]
+                // if the pararameter is multiple: true, fetch the template
+                if (par.multiple && filenameTemplate instanceof List) {
+                  filenameTemplate = filenameTemplate[0]
+                }
+                // instantiate the template
+                def filename = filenameTemplate
+                  .replaceAll('\\$id', id_)
+                  .replaceAll('\\$\\{id\\}', id_)
+                  .replaceAll('\\$key', key_)
+                  .replaceAll('\\$\\{key\\}', key_)
+                if (par.multiple) {
+                  // if the parameter is multiple: true, the filename
+                  // should contain a wildcard '*' that is replaced with
+                  // the index of the file
+                  assert filename.contains("*") : "Module '${key_}' id '${id_}': Multiple output files specified, but no wildcard '*' in the filename: ${filename}"
+                  def outputPerFile = value.withIndex().collect{ val, ix ->
+                    def filename_ix = filename.replace("*", ix.toString())
+                    def inputPath = val instanceof File ? val.toPath() : val
+                    [inputPath: inputPath, outputFilename: filename_ix]
+                  }
+                  def transposedOutputs = ["inputPath", "outputFilename"].collectEntries{ key -> 
+                    [key, outputPerFile.collect{dic -> dic[key]}]
+                  }
+                  return [[key: plainName_] + transposedOutputs]
+                } else {
+                  def value_ = java.nio.file.Paths.get(filename)
+                  def inputPath = value instanceof File ? value.toPath() : value
+                  return [[inputPath: [inputPath], outputFilename: [filename]]]
+                }
+              }
+          
+          def inputPaths = processedState.collectMany{it.inputPath}
+          def outputFilenames = processedState.collectMany{it.outputFilename}
+          
+
+          [id_, inputPaths, outputFilenames]
+        }
+        | publishFilesProc
+    emit: input_ch
+  }
+  return publishFilesSimpleWf
+}
+
+
+
+
 // helper file: 'src/main/resources/io/viash/runners/nextflow/states/publishStates.nf'
 def collectFiles(obj) {
   if (obj instanceof java.io.File || obj instanceof Path)  {
@@ -1723,8 +1882,6 @@ def publishStates(Map args) {
 
           // the input files and the target output filenames
           def inputoutputFilenames_ = collectInputOutputPaths(state_, id_ + "." + key_).transpose()
-          def inputFiles_ = inputoutputFilenames_[0]
-          def outputFilenames_ = inputoutputFilenames_[1]
 
           def yamlFilename = yamlTemplate_
             .replaceAll('\\$id', id_)
@@ -1737,7 +1894,7 @@ def publishStates(Map args) {
           // convert state to yaml blob
           def yamlBlob_ = toRelativeTaggedYamlBlob([id: id_] + state_, java.nio.file.Paths.get(yamlFilename))
 
-          [id_, yamlBlob_, yamlFilename, inputFiles_, outputFilenames_]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -1749,33 +1906,17 @@ process publishStatesProc {
   publishDir path: "${getPublishDir()}/", mode: "copy"
   tag "$id"
   input:
-    tuple val(id), val(yamlBlob), val(yamlFile), path(inputFiles, stageAs: "_inputfile?/*"), val(outputFiles)
+    tuple val(id), val(yamlBlob), val(yamlFile)
   output:
-    tuple val(id), path{[yamlFile] + outputFiles}
+    tuple val(id), path{[yamlFile]}
   script:
-  def copyCommands = [
-    inputFiles instanceof List ? inputFiles : [inputFiles],
-    outputFiles instanceof List ? outputFiles : [outputFiles]
-  ]
-    .transpose()
-    .collectMany{infile, outfile ->
-      if (infile.toString() != outfile.toString()) {
-        [
-          "[ -d \"\$(dirname '${outfile.toString()}')\" ] || mkdir -p \"\$(dirname '${outfile.toString()}')\"",
-          "cp -r '${infile.toString()}' '${outfile.toString()}'"
-        ]
-      } else {
-        // no need to copy if infile is the same as outfile
-        []
-      }
-    }
   """
-mkdir -p "\$(dirname '${yamlFile}')"
-echo "Storing state as yaml"
-echo '${yamlBlob}' > '${yamlFile}'
-echo "Copying output files to destination folder"
-${copyCommands.join("\n  ")}
-"""
+  mkdir -p "\$(dirname '${yamlFile}')"
+  echo "Storing state as yaml"
+  cat > '${yamlFile}' << HERE
+${yamlBlob}
+HERE
+  """
 }
 
 
@@ -1806,13 +1947,10 @@ def publishStatesByConfig(Map args) {
             .replaceAll('\\$\\{key\\}', key_)
           def yamlDir = java.nio.file.Paths.get(yamlFilename).getParent()
 
-          // the processed state is a list of [key, value, inputPath, outputFilename] tuples, where
+          // the processed state is a list of [key, value] tuples, where
           //   - key is a String
           //   - value is any object that can be serialized to a Yaml (so a String/Integer/Long/Double/Boolean, a List, a Map, or a Path)
-          //   - inputPath is a List[Path]
-          //   - outputFilename is a List[String]
           //   - (key, value) are the tuples that will be saved to the state.yaml file
-          //   - (inputPath, outputFilename) are the files that will be copied from src to dest (relative to the state.yaml)
           def processedState =
             config.allArguments
               .findAll { it.direction == "output" }
@@ -1829,7 +1967,7 @@ def publishStatesByConfig(Map args) {
                 // in the state as-is, but is not something that needs 
                 // to be copied from the source path to the dest path
                 if (par.type != "file") {
-                  return [[key: plainName_, value: value, inputPath: [], outputFilename: []]]
+                  return [[key: plainName_, value: value]]
                 }
                 // if the orig state does not contain this filename,
                 // it's an optional argument for which the user specified
@@ -1860,13 +1998,9 @@ def publishStatesByConfig(Map args) {
                     if (yamlDir != null) {
                       value_ = yamlDir.relativize(value_)
                     }
-                    def inputPath = val instanceof File ? val.toPath() : val
-                    [value: value_, inputPath: inputPath, outputFilename: filename_ix]
+                    return value_
                   }
-                  def transposedOutputs = ["value", "inputPath", "outputFilename"].collectEntries{ key -> 
-                    [key, outputPerFile.collect{dic -> dic[key]}]
-                  }
-                  return [[key: plainName_] + transposedOutputs]
+                  return [["key": plainName_, "value": outputPerFile]]
                 } else {
                   def value_ = java.nio.file.Paths.get(filename)
                   // if id contains a slash
@@ -1874,18 +2008,17 @@ def publishStatesByConfig(Map args) {
                     value_ = yamlDir.relativize(value_)
                   }
                   def inputPath = value instanceof File ? value.toPath() : value
-                  return [[key: plainName_, value: value_, inputPath: [inputPath], outputFilename: [filename]]]
+                  return [["key": plainName_, value: value_]]
                 }
               }
+              
           
           def updatedState_ = processedState.collectEntries{[it.key, it.value]}
-          def inputPaths = processedState.collectMany{it.inputPath}
-          def outputFilenames = processedState.collectMany{it.outputFilename}
           
           // convert state to yaml blob
           def yamlBlob_ = toTaggedYamlBlob([id: id_] + updatedState_)
 
-          [id_, yamlBlob_, yamlFilename, inputPaths, outputFilenames]
+          [id_, yamlBlob_, yamlFilename]
         }
         | publishStatesProc
     emit: input_ch
@@ -2559,7 +2692,8 @@ def _debug(workflowArgs, debugKey) {
 def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
   def workflowArgs = processWorkflowArgs(args, defaultWfArgs, meta)
   def key_ = workflowArgs["key"]
-  
+  def multipleArgs = meta.config.allArguments.findAll{ it.multiple }.collect{it.plainName}
+
   workflow workflowInstance {
     take: input_
 
@@ -2716,12 +2850,36 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     // TODO: move some of the _meta.join_id wrangling to the safeJoin() function.
-    def chInitialOutput = chArgsWithDefaults
+    def chInitialOutputMulti = chArgsWithDefaults
       | _debug(workflowArgs, "processed")
       // run workflow
       | innerWorkflowFactory(workflowArgs)
-      // check output tuple
-      | map { id_, output_ ->
+    def chInitialOutputList = chInitialOutputMulti instanceof List ? chInitialOutputMulti : [chInitialOutputMulti]
+    assert chInitialOutputList.size() > 0: "should have emitted at least one output channel"
+    // Add a channel ID to the events, which designates the channel the event was emitted from as a running number
+    // This number is used to sort the events later when the events are gathered from across the channels.
+    def chInitialOutputListWithIndexedEvents = chInitialOutputList.withIndex().collect{channel, channelIndex ->
+      def newChannel = channel
+        | map {tuple ->
+          assert tuple instanceof List : 
+          "Error in module '${key_}': element in output channel should be a tuple [id, data, ...otherargs...]\n" +
+          "  Example: [\"id\", [input: file('foo.txt'), arg: 10]].\n" +
+          "  Expected class: List. Found: tuple.getClass() is ${tuple.getClass()}"
+        
+          def newEvent = [channelIndex] + tuple
+          return newEvent
+        }
+      return newChannel
+    }
+    // Put the events into 1 channel, cover case where there is only one channel is emitted
+    def chInitialOutput = chInitialOutputList.size() > 1 ? \
+      chInitialOutputListWithIndexedEvents[0].mix(*chInitialOutputListWithIndexedEvents.tail()) : \
+      chInitialOutputListWithIndexedEvents[0]
+    def chInitialOutputProcessed = chInitialOutput
+      | map { tuple  ->
+        def channelId = tuple[0]
+        def id_ = tuple[1]
+        def output_ = tuple[2]
 
         // see if output map contains metadata
         def meta_ =
@@ -2734,19 +2892,95 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
         output_ = output_.findAll{k, v -> k != "_meta"}
 
         // check value types
-        output_ = _processOutputValues(output_, meta.config, id_, key_)
+        output_ = _checkValidOutputArgument(output_, meta.config, id_, key_)
 
-        // simplify output if need be
-        if (workflowArgs.auto.simplifyOutput && output_.size() == 1) {
-          output_ = output_.values()[0]
-        }
-
-        [join_id, id_, output_]
+        [join_id, channelId, id_, output_]
       }
       // | view{"chInitialOutput: ${it.take(3)}"}
 
+    // join the output [prev_id, channel_id, new_id, output] with the previous state [prev_id, state, ...]
+    def chPublishWithPreviousState = safeJoin(chInitialOutputProcessed, chRunFiltered, key_)
+      // input tuple format: [join_id, channel_id, id, output, prev_state, ...]
+      // output tuple format: [join_id, channel_id, id, new_state, ...]
+      | map{ tup ->
+        def new_state = workflowArgs.toState(tup.drop(2).take(3))
+        tup.take(3) + [new_state] + tup.drop(5)
+      }
+    if (workflowArgs.auto.publish == "state") {
+      def chPublishFiles = chPublishWithPreviousState
+        // input tuple format: [join_id, channel_id, id, new_state, ...]
+        // output tuple format: [join_id, channel_id, id, new_state]
+        | map{ tup ->
+          tup.take(4)
+        }
+
+      safeJoin(chPublishFiles, chArgsWithDefaults, key_)
+        // input tuple format: [join_id, channel_id, id, new_state, orig_state, ...]
+        // output tuple format: [id, new_state, orig_state]
+        | map { tup ->
+          tup.drop(2).take(3)
+        }
+        | publishFilesByConfig(key: key_, config: meta.config)
+    }
+    // Join the state from the events that were emitted from different channels
+    def chJoined = chInitialOutputProcessed
+      | map {tuple ->
+        def join_id = tuple[0]
+        def channel_id = tuple[1]
+        def id = tuple[2]
+        def other = tuple.drop(3)
+        // Below, groupTuple is used to join the events. To make sure resuming a workflow
+        // keeps working, the output state must be deterministic. This means the state needs to be
+        // sorted with groupTuple's has a 'sort' argument. This argument can be set to 'hash',
+        // but hashing the state when it is large can be problematic in terms of performance.
+        // Therefore, a custom comparator function is provided. We add the channel ID to the 
+        // states so that we can use the channel ID to sort the items. 
+        def stateWithChannelID = [[channel_id] * other.size(), other].transpose()
+        // A comparator that is provided to groupTuple's 'sort' argument is applied
+        // to all elements of the event tuple (that is not the 'id'). The comparator
+        // closure that is used below expects the input to be List. So the join_id and
+        // channel_id must also be wrapped in a list. 
+        [[join_id], [channel_id], id] + stateWithChannelID
+      }
+      | groupTuple(by: 2, sort: {a, b -> a[0] <=> b[0]}, size: chInitialOutputList.size(), remainder: true)
+      | map {join_ids, _, id, statesWithChannelID ->
+        // Remove the channel IDs from the states
+        def states = statesWithChannelID.collect{it[1]}
+        def newJoinId = join_ids.flatten().unique{a, b -> a <=> b}
+        assert newJoinId.size() == 1: "Multiple events were emitted for '$id'."
+        def newJoinIdUnique = newJoinId[0]
+        def newState = states.inject([:]){ old_state, state_to_add ->
+          def stateToAddNoMultiple = state_to_add.findAll{k, v -> !multipleArgs.contains(k)}
+          // First add non multiple arguments
+
+          def overlap = old_state.keySet().intersect(stateToAddNoMultiple.keySet())
+          assert overlap.isEmpty() : "ID $id: multiple entries for " + 
+            " argument(s) $overlap were emitted."
+          def return_state = old_state + stateToAddNoMultiple
+
+          // Add `multiple: true` arguments
+          def stateToAddMultiple = state_to_add.findAll{k, v -> multipleArgs.contains(k)}
+          stateToAddMultiple.each {k, v ->
+            def currentKey = return_state.getOrDefault(k, [])
+            def currentKeyList = currentKey instanceof List ? currentKey : [currentKey]
+            currentKeyList.add(v)
+            return_state[k] = currentKeyList
+          }
+          return return_state
+        }
+
+        _checkAllRequiredOuputsPresent(newState, meta.config, id, key_)
+
+        // simplify output if need be
+        if (workflowArgs.auto.simplifyOutput && newState.size() == 1) {
+          newState = newState.values()[0]
+        }
+
+        return [newJoinIdUnique, id, newState]
+      }
+    
     // join the output [prev_id, new_id, output] with the previous state [prev_id, state, ...]
-    def chNewState = safeJoin(chInitialOutput, chRunFiltered, key_)
+    def chNewState = safeJoin(chJoined, chRunFiltered, key_)
       // input tuple format: [join_id, id, output, prev_state, ...]
       // output tuple format: [join_id, id, new_state, ...]
       | map{ tup ->
@@ -2755,23 +2989,21 @@ def workflowFactory(Map args, Map defaultWfArgs, Map meta) {
       }
 
     if (workflowArgs.auto.publish == "state") {
-      def chPublish = chNewState
+      def chPublishStates = chNewState
         // input tuple format: [join_id, id, new_state, ...]
         // output tuple format: [join_id, id, new_state]
         | map{ tup ->
           tup.take(3)
         }
 
-      safeJoin(chPublish, chArgsWithDefaults, key_)
+      safeJoin(chPublishStates, chArgsWithDefaults, key_)
         // input tuple format: [join_id, id, new_state, orig_state, ...]
         // output tuple format: [id, new_state, orig_state]
         | map { tup ->
           tup.drop(1).take(3)
-      }
+        }
         | publishStatesByConfig(key: key_, config: meta.config)
     }
-
-    // remove join_id and meta
     chReturn = chNewState
       | map { tup ->
         // input tuple format: [join_id, id, new_state, ...]
@@ -2918,6 +3150,10 @@ meta = [
   ],
   "description" : "Runner for demultiplexing of raw sequencing data",
   "status" : "enabled",
+  "scope" : {
+    "image" : "public",
+    "target" : "public"
+  },
   "requirements" : {
     "commands" : [
       "ps"
@@ -3028,10 +3264,10 @@ meta = [
     "runner" : "nextflow",
     "engine" : "native|native",
     "output" : "target/nextflow/runner",
-    "viash_version" : "0.9.0",
-    "git_commit" : "d7d3b3e1de64f07a8b161b68a60098103ff691fb",
-    "git_remote" : "https://x-access-token:ghs_VevxXQvu4BBoh9Z4GlymTfE1DeHryU1sU0kQ@github.com/viash-hub/demultiplex",
-    "git_tag" : "v0.1.1-14-gd7d3b3e"
+    "viash_version" : "0.9.1",
+    "git_commit" : "8da2bf20c5727df1fcdcc997ae87caf562ac4983",
+    "git_remote" : "https://x-access-token:ghs_riWLhGdVGIgxpyesdWQZGphUN4Zki11hGJ7q@github.com/viash-hub/demultiplex",
+    "git_tag" : "v0.1.1-15-g8da2bf2"
   },
   "package_config" : {
     "name" : "demultiplex",
@@ -3045,7 +3281,7 @@ meta = [
         }
       ]
     },
-    "viash_version" : "0.9.0",
+    "viash_version" : "0.9.1",
     "source" : "src",
     "target" : "target",
     "config_mods" : [