How can we see source of attachments on Purchase Order?

Summary: Need to differentiate attachment on item and manually

Content (required): Customer is having attachment at Item which are flowing over a PO and also attached some file on Purchase order manually. How can we differentiate between what is attached at Item and what is attached manually?

Version (include the version you are using, if applicable): 11.13.22.10.0

Code Snippet (add any code snippets that support your topic, if applicable):