title: Companion ads for preroll for Brightcove videos
body: <p>I have a companion ad of 300X250 scheduled to be playing with a certain preroll ad through dfp. When the brightcove video is played, the preroll starts and it should be displaying the companion ad in the neighboring div as well but it isn't doing so currently. </p>
  
  <p>I have tried using the gpt calls for companion cube ads as detailed here <a href="https://developers.google.com/interactive-media-ads/docs/companions/companions-gpt" rel="nofollow">https://developers.google.com/interactive-media-ads/docs/companions/companions-gpt</a> as well as using the brightcove 'bcsyncroadblock' callback function  as detailed here <a href="http://support.brightcove.com/en/video-cloud/docs/working-vast-20-external-companion-ads" rel="nofollow">http://support.brightcove.com/en/video-cloud/docs/working-vast-20-external-companion-ads</a> but haven't been able to get the companion ads to load. </p>
  
  <p>Would appreciate inputs from anyone who has encountered/resolved a similar issue.</p>