You can export your mashed video in 4K resolution.
The ability to export in 4K quality is available on iOS for Pro users or to those who are subscribed to our Unlimited Back-Up plan.
Grandfathered users can export in up to 1080p and free users can export in 720p only.
Enable 4K support
Tap on Settings > More Settings.
Go to Video Recording Quality.
Set the quality to either 4K at 30fps or 4K at 60fps.
You will need to enable 4K video quality in settings for you to export your mash in 4K resolution. Otherwise, they are automatically converted to 1080p even if they are 4K in your camera roll.
You will also need to have at least one 4K video added as a snippet in your mash.
To export your mash in 4K, select Best Quality (4K) from the mashing options:
You will need to have at least one snippet in 4K format for this option to show up.