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Frames and the body read run on your device — sending a read uploads the stills and the clip to your board.
Record in-app, or upload clips from your camera roll — pick several to read them back-to-back.
Upload the original file. A WhatsApp / iMessage / AirDrop copy is re-compressed and loses the true frame-rate — tempo and sequence will turn off. Use the camera-roll original or record in-app. On iPhone, pick the clip from Files, not Photos — the Photos picker silently converts 4K 120 fps to 1080p 60.