FTP Request Filtering not being recognised

Hi Everyone

I am using a VPS server installation of MS Server 2016 on Windows 10 which I connect to via RDP.

Could anyone please tell me why I cannot transfer files any files larger than 30mb to any website FTP account in IIS even after I have set the Request Filtering to 3Gb in the Server level Connection options which are accepted in the website level options also plus I also directly added:

<security>

      <requestFiltering>

         <requestLimits maxAllowedContentLength="3221225472" />

      </requestFiltering>

   </security>

to system.webServer section of the web.config file for the specific website. I have restarted IIS and the app pool for the website many times, but I still get:

550-Maximum file size was exceeded.

 Win32 error:   Access is denied.

 Error details: Maximum file size was exceeded.

550 End

This applies to trying it directly from the local server instance itself via Command Line and also remotely from another computer using Filezilla.

I have been trying for days to work this out but cannot find anything that will remedy the problem.

I am desperate to find a solution, so your help is highly appreciated.

Thanks