2. There is also a Bug situation: this App that can't be connected to the Internet can't be found in the list.
1) At this time, select any App in the list, close "WLAN and Cellular Mobile Data" first, that is, data is not allowed to be used, and then reopen "WLAN and Cellular Mobile Data".
2) Return to the desktop and open the App that cannot be connected to the Internet again. At this point, the system will prompt "Whether to allow the App to use the data network", and click "Allow" to successfully connect the App to the network.
Finally, there is an ultimate solution. Enter "Settings-Cellular Mobile Network", open "WLAN Assistant", then open the app, and select OK when the window pops up.