Hi!
Is it possible to attach a prefab to the tilemap?
In earlier versions of the tilemap system they had a way to add a prefab object to a tile, but in the newest version they got rid of it. I think right now you are suppose to make a tilemap brush to paint prefabs onto the map.
I haven’t learned how to do it yet myself, but there is an example tilemap project called, the RoboDash demo on github. In this project they have tilemap brushes implemented.