When you save media to lineup you will see a Tag when shared checkbox. When this box is checked, when you share that media, your user name and image will appear at the top of the video.
In most cases tagging is the better option, but in certain cases, like if you are a videographer uploading content for a client, you may not want your name to appear at the top of the clip.
When you view your own clips they will not be tagged.
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