Allow us to designate some objects to be exported as tiles in FoundryVTT

For example, if I place a bridge across a chasm, and want the players to be both on during play, I'd like to be able to set the bridge as a roof tile (or just hide it) when players are beneath it, but show it when they're above it.

Currently, the only way that I am aware to do this in the current DA build is to export the entire map without the assets I want as tiles, then again with the assets, take the second exported image into GIMP, Photoshop, etc, and then manually crop out the item.

If designating items as tiles isn't possible the DA engine, simply being able to isolate an asset (or multiple assets) and export them on an alpha channel would be dreamy.