The reason why the Apple 6plus couldn't listen to Red Sleeves Reading after the screen was turned off was because the Apple 6plus had entered sleep mode. Red Sleeves Reading was an audio book that needed to be recorded with a microphone. Therefore, the microphone of the Apple 6plus would be turned off when the screen was turned off, making it impossible to record, so it couldn't listen to Red Sleeves Reading. If you want to listen to the audio book while the screen is off, you can open the sound control application after the screen is locked and select the play button for the red sleeve reading book.