Board Thread:Support Requests - Getting Technical/@comment-6532857-20151211192530/@comment-1251315-20151211203027

That feature is most likely going to be removed, it's been broken for the entire year and they're not fixing it. There is no way to see the list of images only on the wiki, as the magic word just reports all files in the File namespace. If your wiki has the DPL extension enabled, you could probably use a DPL query to report a results count of files with a range of file extensions to see how many images are on your wiki, but if you don't have DPL enabled, then it's unlikely to see that stat.