Thumbnails are especially helpful in a library with many media files, because they give viewers a preview of the video content. A video thumbnail is the first thing that most people see when they interact with a video. A thumbnail is also what is shown in Microsoft 365 search results. You can set up a video's thumbnail in a document library in SharePoint by following these steps:
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Open the folder in the library that contains the video.
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Select the video. The video opens in a new tab in the web browser or in a new window. To the right of the video, select Video settings.
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Select the Thumbnail drop-down list. The two commands you can use to edit a video thumbnail appear.
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If you want to use a picture from your computer as the video thumbnail, select Upload thumbnail.
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If you want to edit the current thumbnail, select Edit thumbnail.
To learn how to make these edits, use one of the following procedures.
Use a picture from your computer as the thumbnail
If you have an image stored on your computer that you want to use as a thumbnail for the video, follow these steps.
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Select Upload thumbnail.
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Type the path for the picture file, or browse to select the image file, and select Open.
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If your new thumbnail looks OK, select Done.
Capture a new thumbnail from your video
You can capture a thumbnail from any video that's stored in an asset library. However, you can't capture a thumbnail from a video if it's stored outside an asset library.
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Select Edit thumbnail.
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From the video, move the seekbar to the new frame you want to use.
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When the video shows the image that you want to capture, select Select this frame. If the image isn't quite right, you can also select Cancel and try again.
