The name is slightly misleading, the command is for any non-text selection. If you check the patch, you will find support for files copied from a file manager.

You can use yank-media to do whatever you want with non-text selections in your clipboard. You can find an example of a function that attaches files copied using a file manager to an org file in this patch: https://yhetil.org/orgmode/87jzsintv0.fsf@gmail.com/

HTH.

You’re looking for rename-file function. For finding out the key of the current entry, you can use bibtex-parse-entry making sure point is on @XXX line.