The app is good and works well but it deletes books 5 minutes after I downloaded them, and no they weren't deleted by a third party, they were still in my phone's storage but for some reason even though it says it can detect any document files it just can't seem to find a simple document in the downloads folder Maybe I've missed something but when it says it can find your document and then blames other sites for not being able to find it 5 minutes after I got ridiculously frustrated.