Due to changes in Android OS policy, external app recording rights are limited, and depending on the nature of android OS and devices, some models may not be able to hear the other person's voice when using the call recording feature through apps such as WhoWho.
This is a difficult part of the post-future app to solve on its own, and some keynotes currently do not support the post-call recording function.
If you do not see the call recording menu in the general settings function, convenience function, the call recording function is not supported. In this case, please use the call recording function of the smartphone basic phone.
You can find the files of recorded calls on the WhoWho app as following direction.
Smartphone file manager (My file) > WhoWho forlder
Run the WhoWho app > See more (button at the top left) > General Setting > Tap the List of Recorded Calls