Vertex Lit Shader: Baked Shadows with Realtime Light
У вашего броузера проблема в совместимости с HTML5
https://www.assetstore.unity3d.com/en/#!/content/75977
By default, using Unity’s built-in shader Mobile/VertexLit lighting works only as either baked or realtime but you cannot display a realtime light on a baked surface. This shader allows a baked surface to also receive realtime lighting.