I purchased animated fogs ( <a href="https://marketplace.roll20.net/browse/set/3697/perfect-spells-pack-1-animated" rel="nofollow">https://marketplace.roll20.net/browse/set/3697/perfect-spells-pack-1-animated</a> ) for a coming game but when I go to test the map the fogs are gone when I go back into GM mode the fogs are either actually gone OR have fallen through the map floor. This is regardless of what Layer I put the fogs on. any help?