So the new Sing feature works pretty well, but getting it to work is pretty hard. I’ve managed to get a workaround to get Sing to work.
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Fully close Music
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Turn Low Power Mode on
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Open Music
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Play the song with supported Sing
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Open the app switcher (don’t close anything tho)
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Go to Control Centre and turn off Low Power Mode
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Go back to Music and play the song
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The slider should appear and work.