Google iOS API thumbnailURL: is not working iOS

I'm using Google API for my iOS app, and I have this code

    [shareBuilder setURLToShare:[NSURL URLWithString:@"http://ift.tt/1gDFMt0"]];

that works well and embeds the url to my post on Google+ as expected.

But another method with deep-link set doesn't:

    [shareBuilder setTitle:@"Uncollectible"
           description:@"Stay cool. Stay debtless."
          thumbnailURL:[NSURL URLWithString:@"http://ift.tt/1OKh1Wx"]];

My code is same as google example

id<GPPNativeShareBuilder> shareBuilder = [[GPPShare sharedInstance] nativeShareDialog];

  // This line will manually fill out the title, description, and thumbnail of the
  // item you're sharing.
  [shareBuilder setTitle:@"New 5k record!"
             description:@"I just ran 5000 meters in 26:16! That's a new record!"
            thumbnailURL:[NSURL URLWithString:@"http://ift.tt/1gDFORo"]];
  [shareBuilder setContentDeepLinkID:@"/races/sf/1234567"];
  [shareBuilder open];

Please advise. Thanks!