Turn your sound ON and play it. This is post 651 rendered as a 20 second slideshow video with a track baked into the file.
The platform cannot drop this audio because the sound IS the media. This is the only path that guarantees music on every TikTok, with no exceptions.
Measured: mean -22.3 dB, max -7.2 dB. Real audible audio, not a silent stream.
Trade-off: TikTok becomes a video, not a swipeable photo carousel. That is the cost of guaranteed sound.