Upload a file audio as blob to Firebase Storage

Hi community, I am recording an audio using MediaCapture and everything fine, that works perfect, then with the data of the file recorded and saved locally I am trying to save the recorded audio in Firebase Storage, I try to convert with the fullPath of the file in a blob to upload it but the conversion always returns empty or null I’ve also tried with file.readAsArrayBuffer but it always returns null, could someone tell me what I’m doing wrong?
I am using Ionic 5

recordAudio() {
    const options: CaptureAudioOptions = { limit: 1, duration: 5 };
    this.mediaC.captureAudio(options)
      .then(async (data: MediaFile[]) => {
        const metadata = {
          contentType: 'audio/amr',
        };

        this.directory = data[0].fullPath;
        const capturedAudio = data[0];
        const localAudioPath = capturedAudio.fullPath;
        const directoryPath = localAudioPath.substr(0, localAudioPath.lastIndexOf('/'));
        const fileName = localAudioPath.substr(localAudioPath.lastIndexOf('/') + 1);
        // const captureDataUrl = this.utils.dataURItoBlobAudio('data:audio/amr;base64,' + localAudioPath);
        const audioBlob: any = new Blob([localAudioPath], { type: 'audio/amr' });
        alert('audiBlob ' + JSON.stringify(audioBlob));
        const storageRef = firebase.storage().ref();
        const uploadAudio = storageRef.child(`files_audio/${fileName}`)
        .put(audioBlob, metadata).then((sus) => {
          sus.ref.getDownloadURL().then((url) => {
            alert('url => ' + url);
          }).catch((er) => {
            this.utils.presentToastSimple('Error al obtener ruta del audio: ' + er, 5000);
          });
        }).catch((error) => {
          alert('Error al guardar la imagen: ' + error);
        });
         //  const fileBlob = new Blob([this.base64ToArrayBuffer(data[0].fullPath)], { type: 'audio/amr' });
      }).catch((err: CaptureError) => {
        alert('CaptureError: ' + JSON.stringify(err));
      });
  }

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