[FEATURE] Delete attachments in workflows

**Is your feature request related to a problem? Please describe.**
I can't delete a file that's been attached to a workflow. It would be nice to be able to delete it so I can replace it.

**Describe the solution you'd like**
Have a button that lets me delete the attached file.

**Do you have a workaround?**
Yeah I can just increment the naming of the file if I want to use an updated version of it attached in a workflow. But I don't have any functionality to clean up any unused attached files in a workflow.