how to restore my pdf in my ibook from iTunes to iphone
when i restore my iphone backup, all the pdf files missed but the collection name still here.
after that i try to create new pdf in my ibook, this time, i sync my ibook to my iTunes first, and back up >restore iphone>restore backup.
this time is successful.
So, I would like to know if that back up is not fully backup my iPhone content?which contents should I sync to iTunes first and back up?
Thanks
iPhone 6 Plus, iOS 8.3