sftpclient sending file ubuntu(netcore) -> ubuntu(netcore)

PasswordConnectionInfo info = new PasswordConnectionInfo(ip, port, name, pass);
using (SftpClient sftpClient = new SftpClient(info))
{
sftpClient.Connect();

 if (!sftpClient.Exists(upload_file_path))
{
     sftpClient.CreateDirectory(upload_file_path);
}

 string fileName = Path.GetFileName(full_file_name);
  using (var file = File.OpenRead(full_file_name))
 {
   sftpClient.UploadFile(file, fileName);
   mir3d.logger.Info($"{fileName} Upload Complete");
}

 sftpClient.Disconnect();

}

I wrote the code.

The file was transferred from the asp.net core (ubuntu 16.04) server to the asp.net core (ubuntu 16.04).

The code was error-free, but the file was not transferred.
Is there any problem?

No source file or test is named. Start by reproducing the shown SftpClient.UploadFile call between the two Ubuntu ASP.NET Core servers, then inspect the transfer result and server-side destination. Done means identifying why the file is not transferred and confirming a successful upload.