Is it possible to run a post function which creates a subtask and copies all attachments from the parent issue to the subtask; with the obvious restriction that everything is done via the REST APIs? Editmeta for an issue shows that the attachments key has no operations; and that leaves this as the only method for attachment addition.
I found this answer (https://answers.atlassian.com/questions/41813368) but it relies on copying the file to disk temporarily. I'm assuming that the ScriptRunner Cloud containers do not allow you to do this; or that it would be unreliable for larger files given the 30sec timeout.
The ideal way would be to simply add attachment IDs from Issue A to Subtask B, but I get the feeling each Issue needs its own copy of an attachment.
Edit: Fixed link
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