UPROPERTY possible meta values:  ImportOnly - Boolean, the property is use only when we import not when we re-import. Cannot be mix with ReimportOnly!  ReimportOnly - Boolean, the property is use only when we re-import not when we import. Cannot be mix with ImportOnly!  MeshType - String, the property is for static or skeletal or both (static | skeletal) mesh type. If not specified it will apply to all mesh type.