How would one create swirling animated fog with the fog prebuilt into the engine
Don’t quote me on this, but I don’t think the distance fog can do that by itself. You could certainly come up with an effect like that using particles with animated sprites, and then fade to the distance fog.
I dont know exactly what you try to achieve, but I think the included fog system cant do it -> better use a particle system like Hyperloop suggested. e.g you could use something like this: https://forums.unrealengine.com/showthread.php?61710-Volumetric-cloud-system-overview (in the thread you can also find a “tutorial”)
That isn’t possible, you’d have to use particles or materials to achieve that.