Thanks for the reply.
I don't see anything in the properties section that says it's locked.
How do I lock/unlock a tilemap?
The layer I'm trying to work on isn't locked.
-edit-
I see the property in the property panel and the tilemap editor. The layer is not locked. However, the background is locked. If I unlock the background (layer 0) I can draw. But I cannot seem to draw on Layer 1.