I just replaced my iPadPro with a new iPadPro with a 256gb of space.  All my books were downloaded to my pervious iPad so that when I traveled or didn’t have internet I could still use my app.  However, now it appears I can’t ask it to download all my books at one time, i must do them 100 at a time. I have over 5400 books and this will take 54 separate download request of me selecting 1 book at a time.
Need help please!!!  There has to be a better way to do this. 
Any suggestions????