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Quick fix for issues when uploading to WhatsApp, Instagram, Facebook, or YouTube.

Re-export a mash that a social app won't accept

Written by Silvia Burgos

Some platforms, such as WhatsApp, Facebook, Instagram, TikTok or YouTube, occasionally reject a 1SE mash because of its video codec. Exporting it again from a free video editor fixes this.

  1. Download a free video editing app.

    • On iOS: iMovie

    • On Android: CapCut or Splice

  2. Import your mashed 1SE video into the app.

  3. Re-export the video at the same resolution as your mash. Upscaling to 4K adds no detail — it only makes the file bigger and slower to upload.

  4. Upload the newly exported video to your desired social platform.

This fixes upload problems caused by the codec.

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