iBooks
I have books that are showing up on my iPhone but for some reason I can not get them to show up on my computer
Question marked as
Make sure iCloud is turned on for Books.
On your iPhone: Settings > Books > iCloud Drive. Also Settings > [Your Name] > iCloud.
On your Mac: System Settings > [Your Name] > iCloud > iCloud Drive > Apps syncing to iCloud Drive options.
If all these are on, try turning them off and back on.