Add Notes to PowerPoint Slide with C# REST API. https://kb.aspose.cloud/slides/net/add-comments-to-powerpoint-with-net-rest-api/

Add Notes to PowerPoint Slide with C# REST API.cs

using Aspose.Slides.Cloud.Sdk;
using Aspose.Slides.Cloud.Sdk.Model;
using System;
using System.Collections.Generic;
using System.IO;

namespace AsposeTestCodes
{
    class Program
    {
        static void Main(string[] args) // For adding slide notes
        {
            SlidesApi slidesApi = new SlidesApi("Client ID", "Key");// API object for notes

            FilesUploadResult uploadResult = slidesApi.UploadFile("SamplePresentation.pptx", 
new MemoryStream(File.ReadAllBytes("SamplePresentation.pptx")));
            // Prepare notes for the slide.
            var notes = new NotesSlide{Text = "Here are the notes for the speaker"};

            // Add notes on the. third slide
            var currentNotesSlide = slidesApi.CreateNotesSlide("SamplePresentation.pptx", 3, notes);

            Stream stream = slidesApi.DownloadFile("SamplePresentation.pptx");
            var fs = new FileStream("UpdatedPresentation.pptx",
            FileMode.Create, FileAccess.Write); // File stream for speaker notes
            stream.CopyTo(fs);// save to file
        }
    }
}