the songs are common mp3 files, stored in a folder: /sdcard/Android/data/com.google.android.music/cache/music but miui player can't read this folder because the nomedia file in dada folder, but removing this file can drain battery. A cool solution could be creating a symbolic link to another folder but sdcard partition doesn't allow it. the best would be setting manually the folder on some setting file of the player.
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