I am not able to save a JIRA Comment when I edit a Comment and paste a clipboard image.
I get the following message: We couldn't save your comment. It might be empty or have invalid formatting. If you copy-pasted, try removing the formatting and adding it directly in the editor.
The same issues applies when I reply to a Comment; it will not save if I paste an image.
Note:
The original Comment was created by me, and already has images in it, so this is unlikely to be "space permission" issue.