MobaXterm: how to upload folder mantaining folder tree?

I'm connected to a remote server in MobaXterm. I'm trying to upload a folder, which contains other levels of folders and files, from local machine to remote server. After drag-and-drop in the panel, I see on the server side that all the files are extracted from all the folders and uploaded in root folder.

Local machine os is windows 10, remote server os is ubuntu 14.04 .

How to upload folders mantaining folders tree?