Upload file recorded by Record RTC in angular and laravel

I'm using Record RTC using angular and laravel

Angular Code:

sanitize(url: string) {
  return this.domSanitizer.bypassSecurityTrustUrl(url);
}

startTimer() {
  this.interval = setInterval(() => {
    if (this.timeLeft > 0) {
      this.timeLeft--;
      if (this.timeLeft == 0) {
        this.pauseTimer();
        this.stopRecording();
      }
    } else {
      this.timeLeft = 30;
    }
  }, 1000);
}

pauseTimer() {
  clearInterval(this.interval);
}
/**
 * Start recording.
 */
initiateRecording() {
  this.startTimer();
  this.recording = true;
  let mediaConstraints = {
    video: false,
    audio: true,
  };
  navigator.mediaDevices
    .getUserMedia(mediaConstraints)
    .then(this.successCallback.bind(this), this.errorCallback.bind(this));
}
/**
 * Will be called automatically.
 */
successCallback(stream) {
  var options = {
    mimeType: "audio/wav",
    numberOfAudioChannels: 1,
    sampleRate: 16000,
  };
  //Start Actuall Recording
  var StereoAudioRecorder = RecordRTC.StereoAudioRecorder;
  this.record = new StereoAudioRecorder(stream, options);
  this.record.record();
}
/**
 * Stop recording.
 */
stopRecording() {
  this.recording = false;
  this.record.stop(this.processRecording.bind(this));
}
/**
 * processRecording Do what ever you want with blob
 * @param  {any} blob Blog
 */
processRecording(blob) {
  this.url = URL.createObjectURL(blob);

  var fd = new FormData();
  fd.append("audio_data", blob);
  fd.append("audio_url", this.url);
  return this.http.post(this.baseUrl + "api/auth/post-audio", fd).subscribe(
    result => {},
    error => {},
  );
}

/**
 * Process Error.
 */
errorCallback(error) {
  this.error = "Can not play audio in your browser";
}

I have to save recorded file in wav format using laravel on server for that i'm using this code:

 public function uploadAudio(Request $request)
    {  
       $blobInput = $request->file('audio_data');  
       Storage::put('audio/test.wav', file_get_contents($blobInput));
        return response()->json([
            'message' => 'Saved',
           ], 200);
    }

No file is being created in storage folder

Any suggestion to solve this issue, Thanks

via Chebli Mohamed