Hi! I hope someone can help me out. Before I continue, this isn't the first time I've used Gimp or made gifs on there.

Anyways,
it's my first time in a few months that I've actually made gifs on there, and I've run into a problem.
Everytime I export and save files as gif files, I go to my documents on my computer and open the gif file and it doesn't move like it should, its basically just a jpeg file.
It has nothing to do with the size of the file either, which is what I first thought.
Can anyone help me out?

You have to tick the "Save as animation" box in the options you get when you export as a GIF.