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1.A cool trick will free up space without deleting files and apps: Try to "rent" a movie with a big file size (a bigger file size than what you have left on storage), click rent and soon you'll get the message saying you don't have enough storage and offers you to go to settings. Click that and magically you will get some storage back (probably it erases some useless data from different apps to try to download the movie). Repeat the process 4-5 times and you'll reclaim 1 to almost 2 Gb or more. 2.Use app to manage ipad storage is a faster way, and you'll also get more storage back.