Adding Footers to PDF via .NET SDK

    public static async Task AddImageFooter()
	{
	    const string localPdfDocument = @"C:\Samples\sample.pdf";
	    const string storageFileName = "sample.pdf";
	    const string localImageFile = @"C:\Samples\sample.png";
	    const string storageImageFile = "sample.png";
	    const string localFolder = @"C:\Samples";
	    const string storageTempFolder = "YourTempFolder";
	    const string resultFileName = "output_add_image_footer.pdf";
	    const int startPage = 2;
	    const int endPage = 5;

	    // Get your AppSid and AppSecret from https://dashboard.aspose.cloud (free registration required). 
	    var pdfApi = new PdfApi(AppSecret, AppSid);

	    using var file = File.OpenRead(localPdfDocument);
	    await pdfApi.UploadFileAsync(Path.Combine(storageTempFolder,storageFileName), file);

	    using var imageFile = File.OpenRead(localImageFile);
	    await pdfApi.UploadFileAsync(Path.Combine(storageTempFolder,storageImageFile), imageFile);

	    ImageFooter footer = new ImageFooter(
	        Background: true,
	        HorizontalAlignment: HorizontalAlignment.Center,
	        Opacity: 1,
	        Rotate: Rotation.None,
	        RotateAngle: 0,
	        Zoom: 1,
	        Width: 24,
	        Height: 24,
	        FileName: Path.Combine(storageTempFolder, storageImageFile)
	    );

	    var response = await pdfApi.PostDocumentImageFooterAsync(storageFileName,
	        footer, startPage, endPage, folder: storageTempFolder);

	    if (response == null)
	        Console.WriteLine("HeadersFootersAddImageFooter(): Unexpected error!");
	    else if (response.Code < 200 || response.Code > 299)
	        Console.WriteLine("HeadersFootersAddImageFooter(): Failed to append image footer to the page of document.");
	    else
	    {
            await (await pdfApi.DownloadFileAsync(Path.Combine(storageTempFolder, storageFileName)))
 				.CopyToAsync(File.Create(Path.Combine(localFolder, resultFileName)));
	        
	        Console.WriteLine("HeadersFootersAddImageFooter(): image '{0}' appended as footer to the document '{1}.", storageImageFile, resultFileName);
	    }
	}