(1) Palm reading general books are stored in iReader-books. Find the book you want to transfer in this folder and just press "Share-Save to Network Disk" (probably not all mobile phones do this, but it's not much different).

There are about two kinds of unusual books, 1. Comics, you can just give it up. 2.zyepub, this is an encrypted palm reading boutique book. Even if it can be uploaded, it is incomplete (meaning that even if you share it with others, you can't use it). Of course, this is for ordinary people like me. Some people may have different rights and means, but they are unknown. Book location: long press the title of the book and click "Details". At the bottom, there is "View the location of the book in the mobile phone". The uploading method is as above.