I don’t know how to use shader nodes….yet as I am a beginner.
Did you see the video link in the original post? I use this to teach myself texture painting.
Can you please tell me at what point ( in the video ) I am to make your suggested changes to the shader node? Never done this before, and wouldn’t know where to begin.
Select your object, switch to Shading workspace ( top row ), on the bottom you see the Shader Editor ( bubble icon on lower top left ) then follow @joseph’s tip (in the video it isn’ used):
( see ? sometimes small images are much more informative)