Hello, I have an iPhone 6 and I updated it to iOS 8.4.1 a while ago. I didn't have any problem with it at first until I had to do a factory reset and then restore. The restore went great, but when I tried to put my music back on my phone via iTunes (version 18.104.22.168) on my Macbook Air I could not get a single song to sync onto my phone. Simply clicking and dragging a song over to my phone doesn't appear to work anymore. I have found that songs that I have purchased via iTunes in the past can be downloaded directly on my phone via wifi, but with over 700 songs, really slow internet, and the fact that easily over half of my songs were ripped from CD's that my Dad owns makes this method virtually useless. I am beyond frustrated and have no idea if the issue is with my Macbook, iPhone, iOS version or maybe even iTunes. Any help is appreciated as my phone has tons of space and no music thanks to this annoying issue. Thanks.