I have all the Harry Potter books in audio form on iTunes and they used to sync just fine when they were in with my music. But then I found out how to categorise them as audiobooks and now they won't sync with my iPhone at all. I have tried putting them back as music but that doesn't work. I made a playlist but that doesn't appear in the list of playlists to sync. I have read that there is a audiobook checkbox in the book category when the iPhone is connected in iTunes but I have no such option on mine. I'm all out of ideas on how to sync these audiobooks. Any help will be greatly appreciated.