File upload asp.net core - System.ObjectDisposedException: 'Cannot access a closed file.'

I am using asp.net core and programming in C#.

I have a method in a controller to upload a file from a form in a view.

public async void UploadFile([FromForm(Name = "aFile")] IformFile aFile)
{
   var filePath = Path.Combine(_webhost.WebRootPath, "Images", aFile.FileName);

   if (aFile.Length > 0)
   {
      using (FileStream fs = System.IO.File.Create(filePath))
      {
         await aFile.CopyToAsync(fs);
      }
   }
}

A 155kb uploaded successfully; however, a 3.38 MB file failed:

System.ObjectDisposedException: 'Cannot access a closed file.'

I have read that the issue may pertain to limits and stream disposal; however, the problem persists despite adding fixes I've seen recommended on stack overflow such as:

[HttpPost, DisableRequestSizeLimit, RequestFormLimits(MultipartBodyLengthLimit = Int32.MaxValue, ValueLengthLimit = Int32.MaxValue, ValueCountLimit = Int32.MaxValue)]

Any recommendations would be welcome :) thanks!