Having issues with paint

Im trying to paint a path in cobble in my game but the paint tool doesn’t allow me to, well. paint.
From my understanding when you select the paint tool it allows you to choose what mat to use under the “Target Layers” spot. however there is nothing there and I have no clue what to do to see it.
This is what I see

But basically you need to Create a material for use with your landscape, and this material needs to contain all the layers. once you have assigned this material with all of its layers to the landscape you should get the choice to paint using said layers.

Alternatively… Make a fully dynamic material.
Like this: UE4 Landscape Material Summary - YouTube , then you dont need to paint