https://www.reddit.com/r/Notion/comments/ikv152/you_can_use_stickers_for_page_icons_and_insert/

Go to any gif site (I used https://giphy.com/) and search for stickers. Download them as you would any other image and insert it into Notion to make your pages come to life.

Also as you can see from the video, you can use gif image as your cover photo as well (I think this is a little more well known).

I have a space theme here going on in my Dashboard page, you can really play around and have fun with this.

edit) I recommend using a sticker and not a gif because stickers are transparent images. They’ll look better for page icons.

Sorry OP but Sticker isn’t a file type.