title: Branch.io link not showing image/thumb in Whatsapp
body: <p>I am creating a deep link using Branch.io in Android as explained in Branch docs, setting an image that I'd like to be the thumb for the link:</p>
  
  <pre><code>BranchUniversalObject branchUniversalObject = new BranchUniversalObject()
              .setCanonicalIdentifier(IDENTIFIER)
              .setTitle("Link de Teste")
              .setContentDescription("This is just a test link.")
              .setContentImageUrl("https://image-link")
              .setContentIndexingMode(BranchUniversalObject.CONTENT_INDEX_MODE.PUBLIC)
              .addContentMetadata("key", value);
  
      LinkProperties linkProperties = new LinkProperties()
              .setFeature("sharing")
              .addControlParameter("$desktop_url", "http://example.com/home")
              .addControlParameter("$ios_url", "http://example.com/ios");
  </code></pre>
  
  <p>When I share the link with Facebook, the image appears correctly:</p>
  
  <p><a href="http://i.stack.imgur.com/qXsNo.jpg" rel="nofollow">Facebook sharing</a></p>
  
  <p>But when I share the link with Whatsapp, no image is displayed.</p>
  
  <p><a href="http://i.stack.imgur.com/gXEli.jpg" rel="nofollow">Whatsapp sharing</a></p>
  
  <p>Any help? Thanks.</p>