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The standard way to copy an attachment in Jira is to make a physical copy. I mean, download it and upload again.
I analyzed the REST API and tried to make a copy of an attachment without creating a duplicate file, but it seems it is not possible, is it?
Interesting, I gave it a try. One thing I noticed is that the "import issues from CSV" option visible in Issue Navigator seems to be broken ( I could not map Attachment field), therefore I used System -> External System Import -> CSV option.
After import I can see a new issue with Attachments, however it is broken
There is the same file visible, but I can't open it, even after downloading. How did you do it? There are also 2 additional boxes displayed, don't know why ;)
I didn't understand the part about changing the link to point to my tenant. I want to make a copy on the same instance, hmm
To accomplish this, I had to closely follow the resolution in this article:
Essentially, generate an API token and update the CSV with it as documented. I guess it has something to do with the importer process having access to the attachments.
Hope that helps.