Anyone know how to remove a file from a transaction with workflow? I can't find any way to do it. Context: I am making a workflow to blank some fields upon copying it and I want it to remove the attached file upon copy. This is easy for all normal fields (and item line fields), but nothing else.

I agree with @KevinJ of Kansas, workflow does not allow you to access sublists or other records. I assume the same rules apply to file attachments.

Yeah, I think so too unfortunately. I had similar issue with trying to change anything on expenses sublist group (not possible) of a transaction. They just don't have it all available.

You'd probably have to do it within a custom WF script action