What is the best way for me to take my iTunes music files on my computer, and convert them to files that can be saved and played on my S10+?
Its been a few years so maybe things have changed, but I was able to play the music from itunes "as is" on my android phone. have you tried just copy a music file or two and see if they would play?
Can also look at smart switch for pc , I belive you can copy your ITunes music to it then to the device see if it converts them .I just tried copying a file from iTunes and putting it on my SD card. I grabbed one app for playing music and it works. But I am not sure if it will work for me yet or not but that was a great suggestion!