How to get the file path?

tutorials
1 
  chooseFile() {
    this.fileChooser.open().then(file => {
      this.filePath.resolveNativePath(file).then(resolvedFilePath => {
        this.fileOpener.open(resolvedFilePath, 'audio/mpeg3').then(file => {
           alert("File Selected!");
           } 
        ).catch(err => {
          alert(JSON.stringify(err));
        });
      }).catch(err => {
        alert(JSON.stringify(err));
      });
    }).catch(err => {
      alert(JSON.stringify(err));
    });
  }

I am new to ionic, I am working on a simple audio upload project.
I have a simple file chooser, I need to get the file location of the selected file in order to upload it.

upload() {
  let options: FileUploadOptions = {
     fileKey: 'file',
     fileName: 'music',
     mimeType: 'audio/mp3',
     headers: {}
     
 
}
const fileTransfer: FileTransferObject = this.transfer.create();
  fileTransfer.upload(URL ,'http://websitename.com/uploads.php', options)
   .then((data) => {
     // success
     alert('Congratulations !! File has been uploaded ');
   }, (err) => {
     // error
      alert(JSON.stringify(err));
   })
}

I am in dead end. It would be great if u guys could help.