Work with Links in PDF via .NET SDK

using Aspose.Pdf.Cloud.Sdk.Model;

namespace Links
{
    public class LinksAdd
    {
        public static async Task Append(string documentName, string outputName, int pageNumber, string LinkAction, string remoteFolder)
        {
		// Get your AppSid and AppSecret from https://dashboard.aspose.cloud (free registration required). 
		pdfApi = new PdfApi(AppSecret, AppSid);

                using (var file = File.OpenRead(Path.Combine(localFolder, documentName)))
		{ // Upload the local PDF to cloud storage folder name.
                    FilesUploadResult uploadResponse = await pdfApi.UploadFileAsync(Path.Combine(remoteFolder, documentName), documentName);
                    Console.WriteLine(uploadResponse.Uploaded[0]);
                }

                // Create link annotation object with supported parameters
                Link link = new Link(LinkAction);

                LinkAnnotation newLink = new LinkAnnotation(
                    new List<Link>() { link },
                    ActionType: LinkActionType.GoToURIAction,
                    Action: LinkAction,
                    Highlighting: LinkHighlightingMode.Invert,
                    Color: new Color(A: 0xFF, R: 0xAA, G: 0x00, B: 0x00),
                    Rect: new Rectangle(LLX: 238, LLY: 488.622, URX: 305, URY: 498.588)
                );

                // Append new link annotation to the PDF on cloud storage.
                AsposeResponse response = await pdfApi.PostPageLinkAnnotationsAsync(documentName, pageNumber, new List<LinkAnnotation>() { newLink }, folder: remoteFolder);

                // Checks the response and logs the result.
                if (response == null)
                    Console.WriteLine("LinksAdd(): Unexpected error!");
                else if (response.Code < 200 || response.Code > 299)
                    Console.WriteLine("LinksAdd(): Failed to append link to the document.");
                else
                { // Downloads the updated file for local use.
                    Console.WriteLine("PagesAdd(): page successfully appended to the document '{0}.", documentName);
                    Stream stream = pdfApi.DownloadFile(Path.Combine(remoteFolder, documentName));
                    using var fileStream = File.Create(Path.Combine(localFolder, "append_links_" + outputName));
                    stream.Position = 0;
                    await stream.CopyToAsync(fileStream);
                    Console.WriteLine("PagesAdd(): File '{0}' successfully downloaded.", "append_links_" + outputName);
                }
            }
        }
    }