Sure, sorry about that. The workflow is working as expected, but I am finding an unexpected issue the Clipboard History Viewer related to the workflow.
The typical behavior after triggering the Clipboard History Viewer (for example, using the keyword clipboard), is that RETURN will paste the selected item into the foreground app, while COMMAND-C will copy that item back to the clipboard so you can paste it elsewhere without automatically pasting into the foreground app.
After installing and running this workflow, COMMAND-C puts /Users/<username>/Library/Caches/com