I have two Apple IDs, one for iTunes and one for iCloud. The reason for this is historical, because there was a time when these were different things and my accounts are that old. I have never really used iBooks so far (there are only a few random PDFs in there and two book I bought years ago), but I want to start now. What I am confused about is which Apple ID to use for iBooks. If I use my iCloud ID I won't be able to access the few books that I already have or buy new ones with the account that I usually use to buy stuff. If I use my iTunes ID then I won't be able to use iCloud Drive, correct? When I opened iBooks on my Mac just now it asked me if I wanted to transfer my books to my iCloud Apple ID and I clicked yes. But only my PDFs are there, not the ones purchased from the iBooks Store.