I have access to two Jira Cloud instances. One is ours, the other is an external contractor's.
Within the task in our instance, we create documentation (text, code, images) in a comment to the task, then copy the content of the comment and want to paste it into the comment in the contractor's instance - but only the TEXT is transferred and instead of images there are gray squares.
This forces us to cut out images from our instance one by one and replace them one by one in the pasted comment.
I see similar reports going back to 2018 - has Atlassian really still not figured this out?
I came across a bug regarding the automation of transferring images - it may be related https://jira.atlassian.com/browse/AUTO-723