 In a YouTube playlist, the thumbnail of the playlist is automatically set as the thumbnail of the video at the top, but you can change that. So, for example, if I don't like the look of this thumbnail, I can simply scroll down until I like the look of, let's say, this thumbnail, Authentic Creativity and Making Money. I find that video, the thumbnail I like, I click on the three dots and I click on Set as Playlist Thumbnail. And voila, now the, if I even ever refresh this playlist, I'm going to go ahead and do that now, the thumbnail of the playlist is now this thumbnail. Now, one thing you might want to note is that if people saw the thumbnail and they clicked on Play and the thumbnail has a particular, some words on it, they click Play All, it will still play the first video. So, if it's misleading, that might be a problem. So, you might want to choose a thumbnail that's more generic. I hope that helps.