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