Adding music to iTunes but won't sync to iPhone 6s
Hi...
I have an iPhone 6S and the most updated iTunes on my MacBook and most updated iOS (9.3.1) on my iPhone 6S... I've been adding music to my iTunes library from the "Add to Library..." option in the File menu and the songs have been adding to iTunes and playing in iTunes on my MacBook just fine but they either won't sync at all to my iPhone or they'll show up under My Device tab with a dotted gray circle next to them indicating that they won't play, and they're not listed in Music on my device at all in either case. I can't find any way to fix this, I have never had this problem before, I tried saving the files both as mp3 and wav files and it doesn't seem to make a difference, I tried saving them as different names and that doesn't seem to make a difference either. I've restarted my phone and my computer, I've signed out and re-signed in to iCloud, and I've tried the "manually manage music and videos" check box but for some reason when I try to turn off iCloud library so that I'm able to have the option to manually manage music and videos, I can turn it off on my phone, but when I connect to iTunes, it still shows that my iCloud library is switched on... not sure if that's my problem or not, but I'm getting really frustrated with this! I just added a song to my library a little over a week ago that was a wav file that transferred and plays just fine. HELP PLEEEEASE!
iPhone 6s, iOS 9.3.1