AI video generation and distribution are usually separate jobs, so I’d make one clean master clip, then adjust the opening, captions, and safe area for each platform instead of pushing identical exports blindly. Also check whether the publisher supports the account type you use and whether it publishes natively or just sends a reminder. Test with one short clip first and confirm audio, caption, and aspect ratio on each destination. I built PostOnce.to for this: it auto-crossposts your own videos and posts between TikTok, Instagram, YouTube, Facebook, X, LinkedIn, Threads, Pinterest, and Bluesky, usually within about 10 minutes, without the TikTok watermark. It can schedule and re-publish older posts too, with a 7-day free trial.