title: ArcGIS Runtime : SceneView load tif file not work
body: <p>I want to load a tif file into SceneView, I tried the method from <a href="https://developers.arcgis.com/net/latest/wpf/guide/add-image-overlays.htm" rel="nofollow noreferrer">this</a>, the code is as follows:</p>
  <pre><code>Esri.ArcGISRuntime.Geometry.Envelope pacificSouthwestEnvelope = ...;
  
  // Create an ImageFrame with a local image file and the extent envelope  
  ImageFrame imageFrame = new ImageFrame(new System.Uri(TifFilePath), pacificSouthwestEnvelope);
  //ImageFrame imageFrame = new ImageFrame(image, pacificSouthwestEnvelope);
  
  // Add the ImageFrame to an ImageOverlay and set it to be 50% transparent
  ImageOverlay imageOverlay = new ImageOverlay(imageFrame);
  imageOverlay.Opacity = 1;
  
  // Add the ImageOverlay to the scene view's ImageOverlay collection
  MySceneView.ImageOverlays.Add(imageOverlay);
  imageFrame.LoadAsync().Wait();
  await MySceneView.SetViewpointAsync(new Viewpoint(imageFrame.Extent));
  </code></pre>
  <p>But it did not succeed.</p>
  <p>Envelope's range is obtained in arcmap.<br />
  The LoadAsync() method is called to ensure that the layer has been loaded.<br />
  Finally, I set the display range of SceneView to the range of imageFrame.</p>
  <p>But I did not see my picture on SceneView.</p>
  <p>Then I tried to load .png and .jpg files, but they were also unsuccessful.</p>
  <p>I don't know what's wrong with my code?</p>