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https://www.pcmag.com/news/349410/how-to-capture-video-clips-in-windows-10
Viewing an mp4 file
UltraCart support may send you a screenshot recording, to play these *.mp4 files on windows 10:
...
https://support.apple.com/en-us/HT201361
Viewing an mp4 file
UltraCart support may send you a screenshot recording, to play these *.mp4 files on Apple OS:
...