okay not sure if anyone can help me, but I am hoping so. I am trying to synch tracks to my phone using iTunes for windows on windows 10. Here's the problem. these tracks are not on apple music, they are tracks that a friend of mine made. Only a few tracks made it to my phone, and the one I love the most did not and I can not get it to go on no matter what I do. they are in .mp3 format. Do tracks have to be in apple music to work on your iPhone/iPods now? If not what am I doing wrong? do I need to convert this one track to .m4a now? Thanks in advance.