if it doesn't work for you... then that sucks if you REALLY want a animated thumbnail. Here what you need to do. 1. go to the chrome web store. 2. search up "Scratch addons". 3. download the extension. 4. search up "Thumbnail uploader". 5. turn the thumbnail uploader on. 6. refresh scratch. 7. make a new project and you'll see a down arrow next to "Set Thumbnail". 8. press it and upload a image or gif what ever you want. 9. and then your done!!!!!
scratch addons (it's a extention)
