Facebook user_photo权限未授予其他用户

Question

美好的一天！，

我制作的iOS应用程序需要来自Facebook的user_photos。所以我使用了Facebook API。我的问题并非所有用户都拥有user_photos的权限

示例

用户1

"permissions": {
    "data": [
      {
        "permission": "user_birthday",
        "status": "granted"
      },
      {
        "permission": "user_photos",
        "status": "granted"
      },
      {
        "permission": "user_about_me",
        "status": "granted"
      },
      {
        "permission": "email",
        "status": "granted"
      },
      {
        "permission": "publish_actions",
        "status": "granted"
      },
      {
        "permission": "public_profile",
        "status": "granted"
      }
    ]
  }

用户2只有public_profile Permission

permissions =     {
        data =         (
                        {
                permission = "public_profile";
                status = granted;
            }
        );
    };

如何使user_photos权限适用于所有用户？

谢谢，我希望你可以帮我这个。