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The filename of a video uploaded to YouTube can be seen by the uploader:
Can the filename of a video uploaded to YouTube be seen by someone other than the uploader?
Assume that the video title is different from the filename of a video uploaded to YouTube.
The filename of a video uploaded to YouTube cannot be seen by anyone else other than the uploader. In other words, it's some private metadata. Note that not all videos have a filename: it depends on how the video was uploaded.