The problem with this request is that the files / notes you are referencing is specific to each row in the Details tab. If you had ten rows, what would you display in the header?

Aside from that, I also wouldn’t know how to accomplish this. You could probably display a count of the files from Details, but even so, it wouldn’t provide the same functionality.

Maybe you could describe the situation that calls for this customization.

You do have the ability to add files at the document header level under “Files”  If you have attached files, the number of files will appear in parenthesis in the header and also as the yellow paperclip icon on any generic inquiries for this item.