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Music only plays files in your Music/iTunes library. I don't believe it will open arbitrary files from the File manager. However, I wonder if you couldn't get a podcast app to open a folder full of mp3 and play them that way. Might be worth a try with something like Overcast.
 
playing standard MP3 files can be done using other apps. Lots in the App Store... But the music file has to be stored-put in that app
 
Music only plays files in your Music/iTunes library. I don't believe it will open arbitrary files from the File manager. However, I wonder if you couldn't get a podcast app to open a folder full of mp3 and play them that way. Might be worth a try with something like Overcast.
I’ve played songs stored on iCloud Drive before on my iPhone.
 
I'm using an app called Melodista for playing downloaded mp3s from Safari. Or files.

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