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External Microphone Help

Since we can't import a professionally-recorded file directly to use as our voicemail greeting, and recording the file with a microphone by playing it over speakers sounds terrible, I'm trying to record it through a direct connection from my speaker-out to my phone's USB C.

The speaker out is stereo (TRS) and I purchased a TRS to TRRS 3.5mm to USB C adaptor, but I'm not picking up sound on the voice recorder app. When plugged in the phone does indicate it will be using the external mic, which it only does when it sees a TRRS connected, so I'm just not sure how the wiring is done between the stereo out and the mic in. In the adaptor are the stereo channels not routed to the mic line?

Any audiophiles out there?