The website builder does not allow you to use vertical thumbnails for videos shot in short format 9x16.
all my clients videos are in shorts format and the majority of content nowadays is shorts. So it feels outdated to not be able to upload a vertical thumbnail to match the video when they play.
As it stands you have to use a horizontal thumbnail and then when they click the video the entire page moves because it's a vertical video and it's a bad experience for the user