There are two ways to synchronize your own eBooks/PDFs between iBooks on the Mac and iBooks on an iOS device.
- using iTunes
- using iCloud
Short answer: synchronising own eBooks/PDFs doesn't work when iCloud synchronising is turned on on the Mac but not on the iOS device.
Long answer and my experience:
Problem 1: my own eBooks/PDFs were not visible in iTunes
Reason: on the Mac -> System preferences -> iCloud -> iCloud Drive there is a checkmark for iBooks.app.
When this checkmark is checked, iTunes is no longer responsible to synchronise own eBooks/PDFs.
Problem 2: I didn't get my own eBooks/PDFs in my iPad/iPhone
Reason: I did not have the iCloud Drive App from Apple on my iPad.
After downloading the iCloud Drive App, there are a few new options in the iOS preferences:
Preferences -> iCloud ->
- iCloud Drive
- and many more
This iBooks option is not available, when the iCloud Drive App is not installed and turned on.
After turning on the iClod Drive option and (after a few seconds) the iBooks option and then starting iBooks, iBooks will ask if you want to use iCloud.
After saying yes, all the own eBooks and PDFs are available for download one by one and controlled from th iOS device.