Board Thread:Support Requests - Getting Technical/@comment-6969786-20140220142734/@comment-5558012-20150119135631

If the video is a Youtube video, the uploader of that video (on Youtube) chooses the image to be displayed. I don't know of a way to do what you ask (and I don't think it's possible). While it's recommended to ask the community first, if we don't know I would recommend that you follow Tupka's advice. Staff should know one way or another.