What's the matter that all the software of OPPO mobile phone has no sound notification when it arrives?

Because the oppo mobile phone didn't open the notification, there was no notification when the software came to the message. Take oppo R 17 as an example, the operation steps are as follows:

1. On the mobile phone screen, find and enter the setting function page.

2. After entering the setting function page, slide the screen to select the notification and status bar at the top of the screen, and click Enter.

3. After entering the notification and status bar settings page, select the notification management button on the screen and click to enter the notification management page.

4. After entering the notification management page, you can see which software has enabled notifications and which ones have not. Select the software picture to open the notification and enter the corresponding settings page.

5. On the notification page, turn on the notification authority and notify the bell and vibration, so that the software will have a sound reminder when it encounters information notification in the future.