Video creatives can include a companion ad; this images usually run next to the video, giving sponsors more visibility throughout playback. See Uploading Ads for more on uploading a video ad.
Companion ad impressions are not added to the total impressions for the campaign. For example, if a campaign has a single video ad, which gets 5000 impressions and 2000 companion ad impressions, the campaign will show 5000 impressions. Companion impressions are tracked separately and displayed in SiteScout UI.
Clicks and Conversions
Clicks and conversions from companion ads are counted toward total clicks and total conversions for the master video ad. Companion clicks and companion conversions are also reported separately. You can use these numbers to calculate the total clicks and conversions from the master video ad.
For example, a video ad could receive 100 total clicks and 50 total conversions, with 20 companion clicks and 5 companion conversions. If you want to know how many clicks came from the master video, subtract the companion clicks from the total clicks:
total clicks - companion clicks = master clicks
100 - 20 = 80
View-through conversions (VTCs) are always attributed to the master video ad impression.
Click-through conversions (CTCs) for videos are attributed to the master or companion click, whichever was most recent.