Hello!
In the recent months we were granted A/B testing for island thumbnails which has been a huge help for finding the right thumbnails for our games. An additional feature that would benefit creators would be allowing us to upload multiple thumbnails to the same island version so that we can switch between thumbnails without having to update the map.
This would be useful for islands hosting weekend events, testing out additional thumbnails, etc without having to constantly update the map and reenter moderation. Even if we were limited to one additional pre-approved thumbnail that we can switch to on the fly would go a long way.