Download not working using filetransfer plugin

Ionic Native
1

i used IonicNative plugin for downloading pdf files
https://ionicframework.com/docs/native/file-transfer/

I can see download complete using alert,but cannot see any download happening.


private filetransfer: FileTransferObject = this.transfer.create(); 
  const url = 'https://www.example.com/example%20test.pdf'; 
  this.filetransfer.download(url, this.file.dataDirectory + 'example%20test.pdf').then((entry) =>
          {
                  alert('download complete: ' + entry.toURL());
          },
 (error) => {
                  alert(error);
});

is this the correct way to do or am I missing some thing?