Hi there!
I created the blend material from one surface and then added two other different textures manually, I’m working with 5.3, but there was a mistake that didn’t allow me to generate material from 3 materials at the same time.
I can see the vertices on my mesh when trying to paint, but nothing changes.
I paint with a black color, I press shift.
I tested the material with another mesh from Megascanes, which had a lot of vertices and good UV.
I have no idea what’s wrong.
Please, help 
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