title: Unity facebook SDK, can not post picture with FB.Feed
body: <p>In my Unity IOS game, I am unsuccessfully trying to use FB.Feed to share a screenshot on the user's wall.
  <a href="https://developers.facebook.com/docs/unity/reference/current/FB.API" rel="nofollow noreferrer">Facebook documentation uses FB.Api to publish the screenshot</a>, but this method does not display a share dialog, it simply uploads the pic to Facebook.</p>
  
  <p><strong>Answers I have found so far:</strong></p>
  
  <ol>
  <li><p>Upload the picture using FB.Api, and then parse the FBResult for the picture URL, and feed that to FB.Feed <a href="https://stackoverflow.com/questions/20228436/facebook-unity-api-post-screenshot-with-link-and-description">Link to answer</a>. 
  This method triggers an error, since it is not possible to use a Facebook URL as source for a picture.</p></li>
  <li><p>Save the picture locally and prepend "File://" to the picture path. <a href="https://stackoverflow.com/questions/22739066/using-facebook-sdk-to-upload-screenshot-in-unity">Link to question</a>. This does not seem to work either, and the <a href="https://developers.facebook.com/docs/unity/reference/3/FB.Feed" rel="nofollow noreferrer">Facebook documentation</a> does not seem to have any information on URL formatting.</p></li>
  </ol>
  
  <p><strong>My question:</strong></p>
  
  <p>Is this the correct (and only) way to display a share dialog when publishing a picture? Or am I looking in the wrong direction?</p>