Recording calls reliably using pre-installed hidden functionality (Samsung Galaxy)

While poking around the *activities* available for the pre-installed apps on an older non-rooted Samsung Galaxy Android 7.0 phone, I noticed one for recording phone calls. It was located in package com.android.phone, and the activity is com.android.phone.RecordCallsAutomaticallyActivity. I created a shortcut for the activity and launched it. Sure enough, it brought up a screen with an option to enable automatically recording phone calls. I turned on that option and made a call. I didn't find any new files in storage/emulated/0. I have a hunch it didn't record, but I don't know how to determine that for sure. Without breaking this question up into a bunch of separate Android SE questions, I'll simply state my objective: **I want to be able to reliably record phone calls.** Currently, I use an app to do that, but it has failed to record a few recent important calls, and that's a big problem. So what I'm wondering is: 1. Did I look in the right place to see if the call was recorded? If not, where do you advise looking? 1. Is there any chance of getting this hidden functionality to work (it is not present in the standard UI) without root? If so, is there anything else you advise that I try doing? 1. Will rooting the device make any difference?