How to lauch APK installation from notification?

Question

Hello :) I want to launch APK installation by clicking the notification. I have already implemented file download and after that notification appears but if I click on such notification.... nothing happens. Here is my code for the notification

    private fun showUpdateReadyToInstallNotification(file: File) {
    val intent = Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(FileProvider.getUriForFile(this, BuildConfig.APPLICATION_ID + ".provider", file), "application/vnd.android.package-archive")
    intent.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true)
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
    val pendingIntent = PendingIntent.getActivity(this, 0, intent, 0)
    val notificationBuilder = NotificationCompat.Builder(this, "UPDATE_CHANNEL")
        .setSmallIcon(R.mipmap.ic_launcher)
        .setContentTitle("Update")
        .setContentText("Your Update is Downloaded and ready to install! Press This notification to install")
        .setAutoCancel(true)
        .setContentIntent(pendingIntent)
    val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    val notificationChannel = NotificationChannel("UPDATE_CHANNEL", "Update", NotificationManager.IMPORTANCE_HIGH)
    notificationManager.createNotificationChannel(notificationChannel)
    notificationManager.notify(100, notificationBuilder.build())
}