how do i copy the lighting from the model viewer into my level? model viewer always shows colors correctly

You can try using this level
Content/StarterContent/Maps/Advanced_Lighting.umap

However, when checking assets, it is still recommended to use the official LookDev blueprint AssetsPreview_BP
【[官方培训]21-UE中LookDev环境创建 | Epic 李文磊(官方字幕)】 [官方培训]21-UE中LookDev环境创建 | Epic 李文磊(官方字幕)_哔哩哔哩_bilibili