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1. Log into MMT.
2. Search for your collection using collection search located in the top-right portion of the UI.
3. In the resulting search result table, click on the desired collection.
4. Click the "Edit Record" link.
5. Click on "Distribution InformationRelated URLs"
6. Add a new Related URL and choose the following options:
   1. URL Content Type: Visualization URL
   2. Type: Get Related Visualization
   3. Subtype: No selection needed
   4. URL: Enter direct link to the desired asset (e.g. PNG file)
7. Click "Done".
8. Click "Publish Draft".
9. Return to Earthdata Search, refresh the page if necessary. Your collection should have a thumbnail preview.

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