You'll need to add thumbnails to your videos so they are properly displayed in your catalog and collections. If you want to check out some expert advice on making your thumbnails the best they can be, check out our blog post on this very topic!
To add thumbnails:
Navigate to Content, choose the video you want to add the thumbnails to, and click Edit. Under the Video sidebar, go to the Appearance. For the Player Image and Catalog Image, select an image for each and then Save the changes.
The Catalog Image will appear in your catalog with all of the other videos you have published. You'll also need to set a Player Image, which appears when someone clicks on a video in the catalog and is taken to the content page. Both are required when making changes in the Appearance tab.
The Catalog Image will appear like the following:
The Player Image will appear like the following:
The Player Image will be used for thumbnails of collection videos as well.
You can replace these images at any time for existing videos by removing the existing thumbnail and uploading a new one:
NOTE: If you've swapped thumbnails and aren't seeing them right away, just hang tight; occasionally, CDNs that deliver the optimized images can be a little slow to update in some areas of the world, but rest assured, it will appear soon!