Thank you for your response. It is not that the video wall paper is too long. It is that the phone cuts it off at 5 seconds. It returns it to the clock after 5 seconds, though the video is longer. I also have a Note 9, and there was an option in settings to prevent it from cutting the video off. But I have not found that option in the s20 plus yet. Is there an option on the s20 plus that allows it to play the full 15 seconds of the video without the phone reverting back to sleep mode?