Hello,
we have in some workflows-states set 'jira.issue.editable=false', so issues can't be edited when issues are e.g. closed.
So uploading attachments is also not allowed due to this property.
Adding comments is still allowed... If I paste an image into a comment, it seems to work - when I save the comment, the image is gone and a not found graphics is shown there:

Is this due to misconfiguration in our workflow or is it a bug, that Jira doesn't show up an error message directly when pressing Ctrl+V?
Rgds
Dieter