title: FBSDKShareDialog not appearing in case of video share
body: <p>I am working on a project where I need to share an image and a video together on Facebook, but facing undefined behaviour.</p>
  
  <blockquote>
    <p>Issue: When I am trying to share a video using <code>FBSDKShareMediaContent</code> class (using below code), <strong>the <code>FBSDKShareDialog</code> is not appearing</strong>, <strong>but it appears when I share only an image</strong>.</p>
  </blockquote>
  
  <p>My code:</p>
  
  <pre><code>let photo: FBSDKSharePhoto = FBSDKSharePhoto.init(image: imageToShare, userGenerated: true)
  
  let vid: FBSDKShareVideo = FBSDKShareVideo.init(videoURL: URL(string:vidUrl!.path))
  
   //  FBSDKShareDialog not appearing in this case 
  let shareContent: FBSDKShareMediaContent = FBSDKShareMediaContent()
  shareContent.media = [photo, vid]
  
  /*
  // FBSDKShareDialog appearing 
  let shareContent: FBSDKShareMediaContent = FBSDKShareMediaContent()
  shareContent.media = [photo]  */
  
  
  FBSDKShareDialog.show(from: self.getCurrentViewController(), with: shareContent, delegate: nil)
  </code></pre>
  
  <p><strong>Video URL:</strong> file:///var/mobile/Containers/Data/Application/2E0E48B7-30E5-4567-8C0B-ACAC100AE389/Documents/AppName/1499773278.555753.mp4</p>
  
  <p>Please help.</p>