2 Set the USB Screensaver Channel as your default screensaver. You can do this by going to Settings > Theme > Screensavers then selecting the USB Screensaver and set as screensaver. You are looking for this icon.
3 Create a folder on your USB device called screensaver
4 Add images to the screensaver folder on your USB device
5 Plug the USB device into Roku your TV
When you plugin your USB device into the TV you might receive these messages