Post comments
You can post comments on a video with your colleagues. You can include timecodes in HH:MM:SS format to refer to specific points in a video.
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In Stream, click the video that you want to comment on.
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Add your comment. If comments aren't allowed on a video, you won't see the Comment section.
Tip
If you are the owner of the video, you can click Delete or Edit for a comment.
Source: Microsoft