delete videos files

My iPad Air is running out of memory but I can't find a way to delete files in a cleanup. For instance I have some videos that can go but all I get to see in Windows Explorer is a couple of snapshots. How can I see and manipulate the rest of the files that are taking up all that space? Thanks

My iPad Pro won't delete videos, neither in the Videos app nor in iTuned Store. When I try, usually the app freezes and has to be quit. I've tried rebooting, doesn't help. I see no way of deleting the videos app (to reinstall it) Help?? Eolake