Why won't my iPhone play songs not purchased from iTunes?

I was having problems getting new music onto my phone from my new laptop, so I did "Autofill from music," which I'm assuming means everything in my iTunes Library. (which is only the things I purchased from iTunes) After that, I tried listening to music on my phone and everything downloaded from other places or ripped from CD's won't play, it just skips to the next song. I've tried backing up my phone and re-downloading everything without any luck. I don't have any of the music anywhere else. Any suggestions?

It aint

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