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Open AutopostTikTok Video Fixer
Upload a clip to your account storage, then re-encode it into a safer TikTok upload profile when you hit file_format_check_failed.
What it changes
Account-scoped upload plus async server-side FFmpeg conversion to a safer upload profile.
Original
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Fixed
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Output profile
MP4 container, H.264 video, AAC audio, yuv420p pixel format, faststart enabled.
If your clip still fails after this, the next things to check are duration limits, private URL access, or an upload that times out before TikTok finishes fetching it.