If you're having problems with playback sound in the app, it's most likely because your sound is fully muted. This can be fixed by doing the following:
Go into ‘Settings’ then ‘General’ and scroll down to where it says ‘Use Side Switch to:’ and set it to 'Lock'.
Even if the toggle button is set to screen lock, not mute, changing the setting to mute and then back again to screen lock should fix the problem.
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