How do I add a MapBox Layer?
Add a MapBox Layer using the Map ID found when you create a new map on the MapBox site. See the image below for the Map ID:
How do I add a MBTiles File?
MBTiles Files can be added via iTunes, downloaded from the web, or opened up from another app (email, Dropbox, etc)
How do I composite layers together?
To composite a layer, select the disclosure button on the right-hand side of the map name in the map list. The layer properties will be shown — in the second cell down there is a setting for layer type. Select overlay if the additional map layers in the list should be allowed to be displayed, otherwise select base if no additional layers should be also displayed. Layers are displayed and composited in accordance with their order on the map list.