Rebuild Attachment Thumbnails?

Can you clarify the reason why you would need to do this?

How are you updating/changing the attachment without removing and reattaching the file?
 
Aha, I see.
Hmm, good point.

I don't think there's a way of doing that, or at least not one I have come across.

Edit: Of course you could do it with an external program, but that's not ideal I agree.
 
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