The official download option doesn't download it to your filesystem as a file. It just lets you watch the video offline in the official app/website. Just tested it now.
The official download option doesn't download it to your filesystem as a file. It just lets you watch the video offline in the official app/website. Just tested it now.
Meaning the video file exists in your file system somewhere, so downloading at a higher speed than possibly viewing the video is an existing functionality in the app.
If you're on iOS no way to access it, and I think on Android it's in protected storage as well.