title: Sharing Play Store Link "Preview will be added" problem
body: <p>I am trying to add a "sharelink function" to  my unity app with the following code:</p>
  
  <p><code>FB.ShareLink(
          new Uri("https://play.google.com/store/apps/details?id=*myappid*"),
          callback: HandleResult);</code></p>
  
  <p>It works but while they view sharing screen it says : 
  "a preview will be added to your post after you share it" and not display the preview of the current post. Possibly because of this many users are canceling the sharing. </p>
  
  <p>How can I solve this problem? </p>
  
  <p>Thanks. </p>