How come I cannot input multiple input files in this tool when I use it in a Workflow? Is there any way I can turn this feature “on”?
If I am understanding correctly, you might need to adjust the workflow to accept a collection folder of input datasets, instead of a single dataset file.
Should that not sound right – would you explain a bit more? That could including share the workflow, and maybe a screenshot of what the input areas look like right now, plus a screenshot of how your inputs are organized in your history. How to share your work is described in the banner at this forum. Sharing a workflow is much like sharing a history – use the Share of Publish button instead, generate the link, and post that back here along with your screenshots.
Thanks and let us know how this goes, and we can certainly follow up more 
Hi,
so, I know how to make a data collection, but I have been searching in Galaxy, where I can adjust the the workflow to accept a collection folder of input datasets, instead of a single dataset file.
Here a screenshot:
Where can I modify the setting which allows choosing the type of input data?
This will greatly help me make a better use of workflows.
Thank you for your time!
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Thanks so much for sharing back the screenshot, very helpful!
Look under the Inputs section of the tool panel. These are special “tools” that specify the inputs to the workflow. These are required at the start for each file that is input by the user when using the workflow.
It is a best practice to connect the Inputs to the first tools, then to reconnect the downstream tools, in the order of processing. Why? This resets the workflow metadata. It is especially important when changing from a single dataset to a collection of datasets, since that impacts how those downstream tools might run with different options. Think of how a tool form can change based on certain parameters: some options might go away, others might be revealed. This is a similar type of situation.
This is a great simple tutorial that will help → Hands-on: Creating, Editing and Importing Galaxy Workflows / Creating, Editing and Importing Galaxy Workflows / Using Galaxy and Managing your Data
Dear Jenna, Thanks a lot, that is very helpful. Now I can use the workflows properly. Have a good week!
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Great @Stephanie_Dv I’m really glad that helped! 