// Create upload session 
// POST /v1.0/drive/items/01KGPRHTV6Y2GOVW7725BZO354PWSELRRZ:/SWEBOKv3.pdf:/microsoft.graph.createUploadSession
string uri = $"https://graph.microsoft.com/v1.0/drive/items/{itemId}:/SWEBOKv3.pdf:/microsoft.graph.createUploadSession";

HttpRequestMessage httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, uri);
await graphClient.AuthenticationProvider.AuthenticateRequestAsync(httpRequestMessage);

// Read the session info from the response
var httpResponseMessage = await graphClient.HttpProvider.SendAsync(httpRequestMessage);
var content = await httpResponseMessage.Content.ReadAsStringAsync();
var uploadSession = graphClient.HttpProvider.Serializer.DeserializeObject<UploadSession>(content);

// Create task
var maxSliceSize = 320 * 1024; // 320 KB - Change this to your chunk size. 4MB is the default.
LargeFileUploadTask<DriveItem> largeFileUploadTask = new LargeFileUploadTask<DriveItem>(uploadSession, stream, maxSliceSize);

// Setup the progress monitoring
IProgress<long> progress = new Progress<long>(progress =>
{
    Console.WriteLine($"Uploaded {progress} bytes of {stream.Length} bytes");
});

UploadResult<DriveItem> uploadResult = null;
try
{
    uploadResult = await largeFileUploadTask.UploadAsync(progress);
                    
    if (uploadResult.UploadSucceeded)
    {
        Console.WriteLine($"File Uploaded {uploadResult.ItemResponse.Id}");//Sucessful Upload
    }
}
catch (ServiceException e)
{
    Console.WriteLine(e.Message);
}

// Create task
var maxSliceSize = 320 * 1024; // 320 KB - Change this to your chunk size. 4MB is the default.
LargeFileUploadTask<FileAttachment> largeFileUploadTask = new LargeFileUploadTask<FileAttachment>(uploadSession, stream, maxSliceSize);

UploadResult<FileAttachment> uploadResult = null;
try
{
    uploadResult = await largeFileUploadTask.UploadAsync(progress);
    if (uploadResult.UploadSucceeded)
    {
        Console.WriteLine(uploadResult.Location);//the location of the object
    }
}
catch (ServiceException e)
{
    Console.WriteLine(e.Message);
}