Go to Group Settings
Choose the tile you'd like to add an animation/thumbnail to and select Edit
Click on the icon highlighted in red below

To add an animation:

Click on Animate
Choose the animation
Click on Save when done

To add a thumbnail:

Click on Add Thumbnail
Select Choose from Icon Gallery to add an icon - OR - Choose Sticker from GIPHY to add a gif
Do note that you can only choose to add either an icon or a gif
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