(change the speed of the costume things cause it looks weird) this is not meant for thumbnails and banners, but for projects, but i'm sure you could use it for a banner/thumbnail?
i found the sparkle video on canva :D not sure if this link exactly works, but worth a try :D heres the sparkle video, without its bg removed https://im3.ezgif.com/tmp/ezgif-3-70da34b8c8.gif if it works, you could from there right click or use two fingers on your mouse pad to save as, and it should download as a gif :) you could find a video/gif bg remover and then upload it to scratch because scratch does not support mp4, but does support gifs. :D gReAt ExPlAnAtIoN its 10:12 pm ;w;
