Is it possible to edit the thumbnail of my video ad?
You can only choose the thumbnail of the video ad only during upload. Once it is uploaded to the dashboard, you will not be able to edit the thumbnail. If you wish to change it, you can delete the video and re-upload the ad then select your desired thumbnail.
For deleting an ad, navigate to the Ad Library tab, hover over the ad and click on the three horizontal dots. Select Delete.
To learn more about video ads, check out Video Ads.