# Workflow is not operating on a collection

**URL:** <https://help.galaxyproject.org/t/workflow-is-not-operating-on-a-collection/586>\
**Category:** usegalaxy.org support\
**Tags:** workflow\
**Created:** [February 8, 2019, 4:04pm UTC](https://help.galaxyproject.org/t/workflow-is-not-operating-on-a-collection/586 "2019-02-08T16:04:14Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jennaj](https://sea2.discourse-cdn.com/flex020/user_avatar/help.galaxyproject.org/jennaj/32/27_2.png) [@jennaj](https://help.galaxyproject.org/u/jennaj)\
**Post date:** [February 8, 2019, 9:46pm UTC](https://help.galaxyproject.org/t/workflow-is-not-operating-on-a-collection/586/2 "2019-02-08T21:46:20Z")

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Hi - Add in an “input” paired-end collection dataset to your workflow before the `Trim Galore!` step.

This screenshot of a sample workflow in the editor shows how to make the connection:

 ![workflow_collection_list_paired_input](https://us1.discourse-cdn.com/flex020/uploads/galaxy/original/1X/1cf5b502270146540336490b44b37caddf5adc91.png)

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_[View the full topic](https://help.galaxyproject.org/t/workflow-is-not-operating-on-a-collection/586)._