title: Unity for iOS push notification has no sound
body: <p>I'm developing iOS application in Unity. I need to show Local Push Notifications. </p>
  
  <p>I use the next code:</p>
  
  <pre><code>public class TestNotification : MonoBehaviour {
  
      void Start(){
          UnityEngine.iOS.NotificationServices.RegisterForNotifications(UnityEngine.iOS.NotificationType.Alert | UnityEngine.iOS.NotificationType.Badge | UnityEngine.iOS.NotificationType.Sound);
      }
  
      public void ShowNotification(){
      #if UNITY_IOS
          var iOSNotification = new UnityEngine.iOS.LocalNotification();
          iOSNotification.alertBody = "Hello!";
          UnityEngine.iOS.NotificationServices.PresentLocalNotificationNow(iOSNotification);
      #else
          Debug.LogError("Platform is not supported.");
      #endif
      }
  }
  </code></pre>
  
  <p>When I call ShowNotification, notification appears in Notification Panel, but without any sound and popup. How to make my notifications show normally? I accepted all permissions(alert, sound, badge) on launch.</p>
  
  <p>Testing Device: iPhone 4s, iOS 9.3.5</p>
  
  <p>Build: Unity 5.4.4f1, XCode 8.2.1</p>