When are attached files (e.g. screenshots) in research discussions removed?
Looking through somewhat older discussions there are many which obviously had some sort of image attached originally (otherwise the post wouldn't make sense) - but the attachment is gone.
A possible reason might be that storage space was to be freed again - assuming that the question has been answered (which then just may lead to incomprehensible discussions).
If that is the case: when are attachments removed - or are there other criteria for removal?