I have a problem, I'm sure there is a solution when I add texture to an element, and I change to Unit -> Texture to look beautiful, shadows disappear, I don't know the solution, Please help, creative people, thank you :)
any way to use a lightmap png file? I think is the solution
If the material on the surface uses an Unlit shader, then the material will not be lit, just as the name suggests. Consequently it will not have shadows change its appearance.
If you stil want to go for a flatter look while keeping shadows, I would suggest you use a cel shader. You can build one with Shader Graph, just google 'cel shader unity'.