I have a few audio books that are only mp3 files, and the music app doesn't seem to like audio books. Is there an app I can easily get the book from my library and get it in a form where it'll save my progress and everything kind of like a podcast? I have downcast, and I saw something about adding files from my IOS library, but the book is over 100 files so that would take forever. Is there an option I can try? Does downcast work with audio books?