title: Unity Ads: No cancel button in ads
body: <p>I'm using unity ads package for my mobile game. Ads itself works fine, but cancel button is missing, and return button doesn't cancel the ad.
  Here's the code i'm using to call ads:</p>
  <pre><code>public void ShowVideoForTry() {
      bool notMaxTries = GlobalManager.Instance.TriesManager.Tries &lt; GlobalManager.Instance.TriesManager.MaxTries;
      if(!Advertisement.isInitialized) {
          Debug.LogWarning(&quot;Advertisement not initialized.&quot;);
      } else if(!Advertisement.IsReady()) {
          Debug.LogWarning(&quot;Advertisement not ready.&quot;);
      } else if(!notMaxTries) {
          Debug.LogWarning(&quot;Player has max tries already.&quot;);
      } else {
          Advertisement.Show(_config.rewardedAdsId);
      }
  }
  void IUnityAdsListener.OnUnityAdsDidError(string message) {
      Debug.LogError(message);
  }
  void IUnityAdsListener.OnUnityAdsDidFinish(string placementId, ShowResult showResult) {
      if (placementId == _config.rewardedAdsId) {
          if (showResult == ShowResult.Finished || showResult == ShowResult.Skipped) {
              GlobalManager.Instance.TriesManager.AddTry();
          }
      }        
  }
  void IUnityAdsListener.OnUnityAdsDidStart(string placementId) {
  }
  void IUnityAdsListener.OnUnityAdsReady(string placementId) {
  }
  </code></pre>
  <p>Am I missing something? Is cancelling even supported?</p>