Also, for anyone thinking of using iBooks with iCloud Drive (iBooks syncing via iCloud, or whatever it's called) and importing ebooks or PDFs from iCloud Drive into iBooks, be aware that they will disappear whenever your device is low on space.
I loaded up a bunch of travel books on a 32GB iPad for an overseas trip this summer only to have them all evaporate shortly thereafter. Every time I got on decent WiFi I would redownload and reimport them from iCloud Drive. Sometimes they would stick around for a few days and sometimes they would be gone in literally hours (gone from the device, not from iCloud Drive).
Incredibly frustrating if you have big reading plans for your offline time. My understanding is that there's no way to get the books to stay put without disabling iBooks iCloud syncing and then loading or importing them the old fashion way (from Dropbox, or via iTunes etc).
I loaded up a bunch of travel books on a 32GB iPad for an overseas trip this summer only to have them all evaporate shortly thereafter. Every time I got on decent WiFi I would redownload and reimport them from iCloud Drive. Sometimes they would stick around for a few days and sometimes they would be gone in literally hours (gone from the device, not from iCloud Drive).
Incredibly frustrating if you have big reading plans for your offline time. My understanding is that there's no way to get the books to stay put without disabling iBooks iCloud syncing and then loading or importing them the old fashion way (from Dropbox, or via iTunes etc).