1. Enter the phone settings page: click "Notifications"— "More notification settings" , and turn on all the switchs
2. Return to the "Notifications" page, find the App and turn on all the switchs
3. Return to the settings page, click "Apps"—"App launch", find the App and turn on the switch
4. Return to the settings page, click "Battery" option to turn off the "Power Saving mode" and "Ultra Power Saving mode" options. (After opening these two options, the system will block many notification messages)