In the upper right corner of the viewport, change "Material" to (shortcut: C ).
Why? Because modern game engines and renderers (like Unity, Unreal, or Marmoset) calculate those dynamically. If you paint shadows into your diffuse map, the engine will double them up, resulting in a muddy, "dirty window" effect. simple diffuse substance painter
Do not use the "PBR Metallic Roughness" default fill layer as your diffuse. Instead, create a new . Rename it Base_Diffuse . In the properties panel, disable the Height , Roughness , and Metallic channels. Only enable Base Color. In the upper right corner of the viewport,