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?
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events