Fog of War linked to Hero tokens?

In the demo and ad on the splash page for the VTT you see the fog of war lifting as a hero token moves into a cave to discover a goblin. I can’t find where to unlock this feature and it’s not in the Support Maps or Fog of War sections. 

Can anyone guide me in how to use this setting that is advertised to exist?

The VTT doesn't support anything like that.  Just a bit of theatrics on the main page, if you go to the VTT page it shows actual features.

It would be amazing if it did though!

Gotcha yeah, it would be amazing if the actual product live up to advertising. 

For edification, that clip is likely showing a player moving their token at the same time the DM is using the reveal brush as the player moves