Yes, Alight Motion can be used to edit and export videos in 4K resolution. The app supports resolutions up to 4K UHD (3840x2160) for both editing and exporting.

To edit a video in 4K resolution, you simply need to import a 4K video file into Alight Motion and start editing. The app's timeline and editing tools will automatically adjust to the video's resolution.

To export a video in 4K resolution, you'll need to go to the Export screen and select the "Custom" option. From there, you can choose the resolution and frame rate you want to export in, including 4K UHD. You can also adjust other export settings such as the video codec, audio settings, and bitrate to ensure your video looks and sounds its best.

It's worth noting that editing and exporting 4K videos can be resource-intensive and may require a powerful device with sufficient RAM and processing power. But if your device meets the requirements, Alight Motion is more than capable of handling 4K videos.