7711_720p.mp4

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Right-click the file and select Properties (Windows) or Get Info (Mac). If the size is 0 bytes or very small (e.g., 1KB), the download failed or the file is a shortcut. 7711_720p.mp4

Since "7711" is a numerical ID and "720p" refers to the resolution (1280x720 pixels), the file is likely from one of these sources: Many sites (like Pexels or Pixabay) assign IDs to clips