Add video into groups and channels
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In Stream, find a video (for example, through My videos, My channels, My groups or Browse.
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Click the More icon , and then click Add to group/channel.
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Find groups or channels you want to add with the Shared with search box.
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Click the group or channel, and then select Add.
Who can add videos to groups/channels
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If a video is a companywide video you can add it to any of your groups/channels even if you aren't an owner of the video.
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If you are the owner of a video you can add your video to any groups/channels you can contribute to.
Source: Microsoft