How to put mp3 files onto free music app on iPhone?

I have 220 mp3 files I would like to store on my phone but not on the apple music ap but the free one you can buy on the App Store so I can continue donwloading via my phone and not having to connect my phone to the laptop ect.

Just select and add the mp3's to your itunes music list, then copy to the iphone. I do this all the time.

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