On the thumbnails of the assets you can see differents icons :The material requires UV unwrapThe material or the layer use bump onlyThe material or the layer use bump and displacementThe material or layer has been thought to work on a surface (walls, ground,...

General idea | Exemple | Special case | LimitationsGeneral idea Layerd materials is based on the asset library of Blender. You can simply drag and drop layers into the shader editor and place it just before the material output. You can place several layers on the same...