Hi, My iPhone is getting full because I have a lot of audio books in iTunes. I have been using "Sync All Audio Books" setting, so it has been syncing all book in Library/Books. When I noticed that the drive is getting full, I went to Library/Books and unchecked many audio books thinking that during the next sync it will delete unchecked audi books from the iPhone, but it does not do that. I need to manually select which audio books I want to sync, which is a pain. So what does unchecking do in Library/Books? Thanks.