Check the file first
Most upload failures are the file, not the app. TikTok accepts common formats up to 287.6 GB on paper, but in practice keep clips under a few GB and in MP4 with H.264 video. Odd codecs from screen recorders and editors are the classic culprits: re-export the clip as plain MP4 and try again. Copyrighted audio can also silently kill an upload at the processing step, which looks identical to a network failure.
Check the connection
Uploads need stable upstream, not just fast downloads. Switch to Wi-Fi if you are on shaky mobile data, and avoid uploading while on a VPN that throttles. If the progress bar freezes at the same percentage every time, the connection is dropping mid-upload: restart the router or move closer to it.
The cache trick
When the file and the connection are fine, a corrupted upload queue is usually left. Force-stop TikTok Mod Cloud build, clear cache (not data), reopen, and re-upload. This clears the stuck queue without signing you out. If drafts are involved, save them first, since the nuclear option, reinstalling, wipes on-device drafts. Creators who download a lot should also read the watermark-free download guide, which covers the download side of the same pipeline.
