When you upload a video to SharePoint, OneDrive, Teams, or Yammer, Stream will autogenerate a thumbnail from the video's contents. You can change the thumbnail of audio or video files by uploading a new one or picking a frame from the video as the new thumbnail.
To pick a thumbnail from the video:
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Navigate to the video and open it.
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Select Video settings from the upper-right corner of the screen.
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Video settings will open in a pane to the right of the video.
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In the Thumbnail field, select the Edit thumbnail icon.
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On the player, move the seekbar playhead to the frame of the video you want to set as the thumbnail.
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Select the button Select this frame in the Thumbnail field to confirm your choice.
To upload a thumbnail for a video or audio file:
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Navigate to the video or audio file and open it.
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Select Video settings or Audio settings from the upper-right corner of the screen.
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Settings will open in a pane to the right of the file.
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In the Thumbnail field, select the Upload icon.
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Navigate to the thumbnail you want to upload and select it.
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Confirm your changes.
