As an idea, links for missing media files (either in the changelog or in wiki pages) could go to a page in the media manager where you can either upload a new file with that name or if the file did exist in the past view these old revisions and have the option to restore one of these revisions.
As an idea, links for missing media files (either in the changelog or in wiki pages) could go to a page in the media manager where you can either upload a new file with that name or if the file did exist in the past view these old revisions and have the option to restore one of these revisions.