Duplicating PDF attachments

Hello,
When you drag a PDF attachment between items, it gets moved. However, sometimes I want to duplicate. In that case, I normally say "show file" (which takes me outside Zotero) and then I re-attach the file.

Ideally, I'd like to have a quicker way to:
(1) Duplicate a PDF within an item
(2) Copying a pdf between items (rather than moving it).

Just having (1) would be fine for me, as I would be happy to duplicate, then drag/drop to move.
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