No material is added to my model, but there is a reflection texture on the model. I don’t know why？
Hi @dajiangaok2021 and welcome,
Yes, if you add a render component and reference a render asset manually, the material will not get referenced automatically.
You can either drag and drop it on the material slot, or use the Template that gets created automatically when importing the model.
Drag and drop the template into the scene and it will automatically reference all included models with their materials.