title: App crashes when picking image
body: <p>I am using the below code for uploading image.</p>
  
  <pre><code>public async void btnAttachment_Tapped(object sender, EventArgs e)
  {
      await CrossMedia.Current.Initialize();
      if (!CrossMedia.Current.IsPickPhotoSupported)
      {
          await DisplayAlert("Photos Not Supported", ":(Permission not granted to photos.", "OK");
          return;
      }
  
      _mediaFile = await CrossMedia.Current.PickPhotoAsync();
  
      if (_mediaFile == null)
          return;
  
      LocalPathLable.Text = _mediaFile.Path;
  
      FileImage.Source = ImageSource.FromStream(() =&gt;
      {
          var stream = _mediaFile.GetStream();
          _mediaFile.Dispose();
          return stream;
  
      });
  }
  </code></pre>
  
  <p>In this after selecting an image, the app crashes suddenly.</p>