Use this scene to check your models. After uploading, place your asset into this scene by clicking on it, so it loads at the center of the scene instead of dragging it. Pay particular attention to the scale, dimensions, rotation, and orientation of your model. Ensure you are using OpenGL normal maps and check the orientation of polygon normals. For assets that include light sources and emissive materials, use the night version of the scene to check the brightness. Note that the Subdivision Surface modifier - Level Viewport is allowed a maximum of 1.