Power Automate condition not working for filtering files

Question

I have a flow that copies files correctly, but when I add a condition to filter the files to be copied, I get an ActionBranchingConditionNotSatisfied error in the Copy Files action.

I have tried changing the File Identifier, relocating the condition in the flow, adding an array filter, and adding the Get File Content action, all without success.

Is there another action I should add to the flow that the condition should use?

Thanks for any advice!