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Users can sync "Teens18yo-(1399).mp4" with another file (e.g., 1400 or 1398) to see what a different person in the same demographic was doing at the exact same moment, creating a "day in the life" comparison across different cultures or locations.
If this is for a film or social media project, consider What it is: A split-screen or "picture-in-picture" toggle.
If this is part of a video archive or social project, a great feature would be
If this belongs to a series of clips following a group of people, you could add a