You might encounter codec issues when uploading 1SE videos to platforms like Facebook, Instagram, TikTok, or YouTube. Although we have resolved most of these problems over the years, some compatibility issues may still arise on specific platforms.
For those cases, here is a solution:
Download a free video editing app.
Import your mashed 1SE video into the app.
Re-export the video at the highest resolution possible (preferably 4K).
Upload the newly exported video to your desired social platform.
This should resolve any upload issues caused by codec incompatibility.