I can't stress the importance of this one enough. I don't know why animated GIFs don't animate on the page itself, either (which I think is a related issue? It's the same "seperate page for seeing actual submission" problem). There doesn't seem to be any reason for it, the file type's the same, too. A good chunk of my work is animation, and I would really like for people to be able to see the animations I make without having to click download. Some people might even forget to click download. It's really a strange choice.
Here's a sample submission. It's nothing special, but there's something a little off about not being able to see it animate on the page.
I really like this site otherwise, it's just this one issue that's bugging me a lot.