Sketchful.io can't be played in landscape position.
Please turn your device back to portrait!
Less likely, but possible. Some video files come with a lightweight DRM (Digital Rights Management) lock. A "fix" in this context would mean removing that DRM to allow playback on any device.
I'll do my best to provide a helpful and informative response.
. (Note: While listed for AVI, this often triggers header repairs for MP4 as well). Transcode with VLC
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