You can't. The metal protective shell will interfere with the wireless charging signal and affect the wireless charging function.
In order to get a good charging experience, please use non-metallic protective case, it is recommended to use the original protective case.
The mobile phone standard protection case has no effect on wireless charging. If you use other protection cases, it is recommended to remove the protection case before wireless charging the mobile phone.
If our phone case is metal, it will affect the effect of wireless charging, or even can not be charged. Just like Xiaomi's wireless charger, it has