Just change this bit:
string uploadsFolder = @"\\10.10.10.67\AQSImages\IdPictures\";
string MyUserDetailsIWantToAdd = $"...";
string filePath = Path.Combine(uploadsFolder, MyUSerDetailsIWantToAdd + MyUploader.FileName);
using var fileStream = new FileStream(filePath, FileMode.Create);
Just fill in the bit "..." with the user details.