Board Thread:Support Requests - Getting Technical/@comment-4022888-20170916023957/@comment-1757994-20170916203341

You can delete specific versions of the image (except for the latest one) using the delete link on the left of the history.

As for having your name associated with the image: Although it's possible for specific images to have specific, different copyrights, that isn't the case on your wiki.
 * 1) anyone reading the history can see who uploaded the original version, while yours is just a reversion
 * 2) nobody owns the image, because all contributions to any wiki are contributed to the creative commons (i.e., everybody)