Why can't I sync all my books?
I'm using iTunes 12.4.1.6, with iBooks 1.5 on OS X 10.11.5, along with an iPad Mini and iPhone 6. My iBooks collection contains about 360 books, including data sheets for electronics components, recipe books, photography books, you name it. The formats include ePub and PDF.
In iTunes I can only see a collection of 53 books, which appear to be ones that I have bought from the Apple Bookstore.
How can I get iTunes to recognise all the books I have in iBooks and sync them across to my iPad Mini and iPhone 6?
If that can not be done, what book reader app can I used on the iPad and iPhone which will allow me to read PDF and ePub, along with annotations, notes and bookmarks?
iMac, OS X El Capitan (10.11)