Webclient uploadfile problem

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C#

Hi all, just experimenting with uploading a file to my local web server in preparation for a task I have and I'm having problems uploading a very small file - no errors it just doesn't arrive at the server, the directory permissions on the server ( I changed them whilst troubleshooting ) are read / write for the whole world ( it's an Apache server ) so I'm asking for help - downloading files works perfectly.
Here is what I've tried

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace DownloadFile
{
    class DownloadFile
    {
        WebClient client;

        static void Main(string[] args)
        {
            String URLRoot = @"http://10.10.1.11/Downloads/Data/";
            String UploadFname = "File.txt";
            String Msg = "This is headed for the server";

            File.WriteAllText(UploadFname,Msg);

            String UploadFullPath = Path.Combine(URLRoot,UploadFname);

            DownloadFile df = new DownloadFile();
            df.client = new WebClient();
            
            if (File.Exists(UploadFname))
            {
                 df.client.UploadFile(UploadFullPath, UploadFname);
            }
            df.client.Dispose();
            Console.ReadKey();
        }
    }
}

What I have tried:

As shown in the code above