Bumping this thread up, as we just released major update to our Advanced File Gallery - hope some of you will find it useful 
Advanced File Gallery now fetches files not only from File and workdoc columns, but also from the item updates. Now organizing files is getting more effective.
You can start a free trial here. If you already tested our app, but you’re interested in checking the recent update - send me a DM so I can extend your trial period