There seem to be plenty of resources for how to do it (even on this website), but I'm struggling with the process.

Can someone provide a link to an example pdf with the working animations in it? The only I see have buttons and are interactive (but aren't working on my machine anyway)-- what I would like is even simpler, just a looping gif file that never stops (I'm trying to show the evolution of a system, against certain parameters and time).

Thanks for any examples.