TikTok video saved but there's no sound
TL;DR fix
On iPhone: your ringer switch is probably on silent — iOS Photos respects it and mutes playback even when the audio track is there. Flip the switch, or tap the speaker icon at the bottom of the video in Photos.
You downloaded a TikTok and the video plays but you hear nothing? That's almost always a codec or player issue, not a missing audio track. The audio is in the file - your player just can't read it. Here's how to confirm and fix.
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