How can you ibigay GIFs on fanpop?

That's how gif. Files work
When another user downloads it, it can ilipat in their desktop browsers, or phone gallery in my case

Most sites are set up that way. Otherwise, you'd be spending an oras to load one awnser on a question

If you are trying to use a gif as an icon or in an answer it won't work. However if you upload it to the larawan section, it usually works.