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I am wondering how to save an audio file in Xamarin forms. I can get the location where to save to AppDataDirectory using Xamarin.Essentials:

var mainDir = FileSystem.AppDataDirectory;

But I am not sure how to save it in code, right after recording it using the NateRickard AudioRecorder Plugin:

var recordTask = await recorder.StartRecording();
var audioFile = await recordTastk; //audioFile is of string datatype

Its same as saving/creating any binary file in C#? Say its same as saving an image file? And additionally do I need to use Dependency Injection to save it using platform specific code, or I can manage to only do it from the PCL code?

The docs explicitly discuss this:

Accessing the Recorded File

There are multiple ways to access the recorded audio file path:

• The Task-based API will return the file path when the task completes. The Task can be awaited or use standard Task
  continuation APIs.


• The Event-based API will return the full path to the recorded audio file in the audioFile parameter of the AudioInputReceived event
  
  handler.


• The GetAudioFilePath () method on the AudioRecorderService class will return the recorded audio file path.

These will all return null in the case that no audio has been recorded
yet or no audio was recorded/detected in the last recording session.

Once you have the path to the recorded audio file, you can use
standard file operations (for native/.NET Standard) and/or a cross
platform file system abstraction like PCLStorage to get a stream to
the file data.