Kneel and beg the Samsung prompt bell to knock on the door three times

Hello, I seem to have encountered your problem before. The following are my original solutions and methods. I hope I can help you. Please forgive me if there is any mistake! The operation method of changing the notification ringtone by mobile phone is as follows: 1. Open Settings-(Device)-Sound-Ringtone-Default Notification-Select the ringtone. If you are prompted to choose the open mode, it means that your mobile phone has installed a third-party ringtone download software, and you can also choose the ringtone downloaded by this software as the notification ringtone. 2. If the mobile phone changes the ringtone to display blank content, it is recommended to open the mobile phone settings-(General)-Application Manager-Menu button-Reset application preferences and try again. Thank you very much for your patience. Please adopt it if it helps. Wish you a happy life! thank you