To set the thumbnail for your file, select the media file(s) to modify on your Uploads page by checking the box(es).
From the Actions dropdown, select Change Thumbnail
From the lightbox, select desired imaged and hit Submit
From the edit item page find the Thumbnail section and click on the image desired.
When you are finished with your edits, click Save or Save And Submit For Review.
Note: It might take up to 24h for you to see actual changes on site due to caching.
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