Ionic downloaded file doesn't open

Ionic Framework
1

hello,
my ts file is:

Download() {

    const fileTransfer: FileTransferObject = this.transfer.create();
    if (this.plt.is('android')) {
      this.storageDirectory = cordova.file.externalDataDirectory;
    }
    const url = 'https://s7.dosya.tc/en2.php?a=server17/b0lra0/Atiye3.mp4&b=b0a413791d17f4a78d45dcd9536fcc5b';
    
    this.file.createDir(this.storageDirectory, 'my_downloads', true).then(response => {
      //const fileTransfer: TransferObject = this.transfer.create();
      alert('directory created: ' + JSON.stringify(response));
      fileTransfer.download(url, this.storageDirectory + '/my_downloads/Atiye11.mp4').then((entry) => {
        alert('file download response' + JSON.stringify(entry));

        this.url2 = entry.toURL()
        this.normUrl = this.webview.convertFileSrc(this.url2)
      })
        .catch((err) => {
          alert('error in file download' + JSON.stringify(err));
        });

    }).catch(err => {
      alert('Could not create directory "my_downloads" ' + JSON.stringify(err));
    });
   

  }

my html file is :

<ion-button (click)="Download()">İndir</ion-button>
  <video width="100%" height="240" controls>
    <source src="{{normUrl}}" type="video/mp4">
  </video>

the output is file downloaded but i can’t access the file. how can i access it ?