How to set the WeChat call reminder sound?

In terms of mobile phone model "OPPO-Reno5-Pro" and mobile phone "WeChat version 8.0.33",

In this case, in the mobile phone WeChat, just set a ringtone.

1. Open the mobile phone WeChat and click me.

2. On my page, click Settings.

3. On the Settings page, click New Message Notification.

4. On the new message notification page, click the ringtone.

5. After entering the ringtone page, click Replace.

6. On the page of selecting ringtone, select ringtone and click Set as ringtone.

So the ringtone of your mobile phone WeChat is set.