Fog of War is something your VTT should handle. Just load the animated map into it and it should work.
If you are using DA as a VTT (which it isn't!), you can use the black smoke effect, but it could be hard to handle for your PC.

On the long run this is planned by the devs: https://dungeonalchemist.upvoty.com/b/feature-requests/fog-of-not-war/

AD would be the best VTT, if you could place black solids with drag and drop like rooms on the map... That you could delete while playing :) i am really looking Forward to it, thank you

+1 DA definitely needs fog of war

This is what i need, like really need ;)

I am using the black smoke effect to obscure undiscovered parts of the map, when the players get close you can use the remove effect option to clear it