How to save a recording from expo-av Audio to a file? And how to extract waveform numeric signal from Audio object?

Expo SDK
1

Expo SDK Version: 3.28.2
Platforms: Android (managed)

I am using expo-av Audio to recording (exactly like the audio-recording-example app GitHub - expo/audio-recording-example: Audio Recording Example ).The problem is I can’t figure out a way to either save the recording to a file or to extract the audio data from Audio object. Anyone can help me with that?
Cheers!

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