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I use Youtube Music, also. It's great. It does offer the option to download music. I think it's 10$ USD a month. No ads.

That's nice. Although what I need is a music player that plays music I already have in my computer as mp3:s and I copypaste that to my phone and want to play it in specific order according to the file name.

Found a new app that I'm trying out if it's any good.