Any way to draw over fog of war?

I'm brand new to roll20, so forgive me if this is covered somewhere- I looked but couldn't find anything. Is there any way to draw on top of the for of war? I want to sketch in rooms over top of my map and then only reveal after areas are cleared- I have some maps with locations of traps ect marked so I don't want to show them right away. I think I can arrange it to work around combats, I don't need tokens on top of fog of war, but I'd love to draw over it, is this possible?

No, you cannot draw on top of the Fog of War. However, you could use drawings to cover up the information players shouldn't see.

hmm, ok. I'll have to test it and see if I can make it reasonably unobtrusive on my maps, thanks!

One thing I do is I try to edit maps with GM information on them to remove them. It is not always easy though. :( - Gauss