By following the below mentioned steps, you can easily connect FTP/SFTP as root.
  • Start WinSCP. Login Dialog will appear.
  • Select your File protocol and choose SFTP.
  •  Fill the Host name field with your server hostname , username as root and root’s password in the Password‘s field, for Port number use 22.
  • Click over Save button and type site name.
  • Click over Login to connect.
Once it is successfully logged in you will see the remote files on the right side of the window . On the left side are your local files. You can easily drag and drop from left to right and vice-versa.
Thus, with the above given steps you can connect FTP/SFTP as root. 
Check out the video tutorial to get in detailed procedure. Also, you may refer to given blog.
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