Thanks, Star, but that did not work, either. I know my flash drives are fine as they play on other devices, and when I record from Casio to flash drive, that song always plays back. I was trying to record songs for a church that is closed right now, as the pastor is videotaping his sermons. If I can't get it to work on my Casio, I doubt that it will work on our Clavinova USB port at the church. I even tried dowloading a file from Freesound, which worked for me fine when I played a show a few years ago, but now is not recognized. Sigh.....🙄