How to create sub sub sub folders

I am trying to create sub folders of folder but experiencing problem.

Under Zoho Documents -> My Folder ->Right Click ->Create Folder creates folder without problem but I would like to have sub folders tree of newly created folders and it's impossible to do so (Is this a known bug?)

After creating several folders, clicking at My Folder lists all the folders on Desktop panel (Right panel) and they have check boxes on them but I can't click/select them. I can right click them to rename and delete. So, sharing, moving, tagging, etc. on folder level seems impossible.

Kept on exploring and finding more and more bugs.