We’ve added more control for the default display thumbnails for your videos. If unset, Mux Video uses the midpoint of an asset as the default thumbnail, but you can now use the API or dashboard to manage the thumbnail_time field. This controls the thumbnail.jpg or thumbnail.webp that is returned for https://image.mux.com/{PLAYBACK_ID}/thumbnail.jpg. This does not change the existing support for a specific time (e.g. https://image.mux.com/{PLAYBACK_ID}/thumbnail.jpg?time=42).