If you are sending videos to yourself, the tracking will not take place.
This is intentional so that you don't accidentally count when you are viewing your own videos.
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You have to open the videos on a device different than the one you sent them from, while connected to a different internet.
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For example, If you send yourself a video on the computer, you have to open the video on your mobile device, while connected to a different internet than your computer, such as mobile data.