How does oppo r9splus customize the quick reply of incoming SMS?

Oppo r9splus custom incoming SMS quick reply step is to set-phone-incoming SMS rejection, and you can edit the content of the rejected SMS. The specific steps are as follows:

First, the desktop discovery settings are as follows:

Second, the mobile phone settings found in the settings are as follows:

Third, in the mobile phone settings, find the incoming call rejection message, and edit the message directly after opening it, as shown below: