Why can't I apply texture paint to my object in blender 2.8? I can apply paint to a cube, but not to my complicated object, even though I defined the material and I linked the image texture to the principal in the shader. It seems I cannot select anything in the UV map, so that might be the problem. (apologies but for some reason I cannot comment on my own question...)
I think you have to connect the image texture node to your shading node instead the rgb one.