Lock Screen images doesn't changing in real time

I was using this sample to change the lock screen images and it's working fine but the issue is that it is not changing the image in real-time. I have modified the code and added a time span of 5 sec so that images can change after 5 seconds, it is changing the image on lock screen but not in real-time.

Code `List photos = new List() { "https://images.unsplash.com/photo-1531804055935-76f44d7c3621?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8Mnx8cGhvdG98ZW58MHx8MHx8&w=1000&q=80", "https://images.pexels.com/photos/556666/pexels-photo-556666.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500", "https://images.unsplash.com/photo-1530510004231-720218d936da?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8MTN8fHBob3RvfGVufDB8fDB8fA%3D%3D&w=1000&q=80", "https://thumbs.dreamstime.com/b/landscape-nature-mountan-alps-rainbow-76824355.jpg" }; StorageFolder tempFolder = ApplicationData.Current.LocalFolder;

        if (!Directory.Exists($"{tempFolder.Path}\\screensaver"))
            tempFolder = await tempFolder.CreateFolderAsync("screensaver");
        else
            tempFolder = await tempFolder.GetFolderAsync("screensaver");

        int count = 2;

        foreach(var photo in photos)
        {
            IRandomAccessStreamReference thumbnail =
            RandomAccessStreamReference.CreateFromUri(new Uri(photo));
            StorageFile imageFile = await StorageFile.CreateStreamedFileFromUriAsync($"photo{count}.png", new Uri(photo), thumbnail);
            try
            {
                if (imageFile != null)
                {
                    var newImgFile = await imageFile.CopyAsync(tempFolder);
                    await LockScreen.SetImageFileAsync(newImgFile);
                    // Retrieve the lock screen image that was set
                    IRandomAccessStream imageStream = LockScreen.GetImageStream();
                    await LockScreen.SetImageStreamAsync(imageStream);
                    await Task.Delay(TimeSpan.FromSeconds(5));
                }
            }
            catch(Exception ex)
            {
                await new MessageDialog(ex.Message).ShowAsync();
            }
            count = count + 1;
        }`

microsoft / Windows-universal-samples

Lock Screen images doesn't changing in real time #1336