FTP does not see root directory

[vrapp]

I insert NTFS-formatted USB drive with some files in the root directory. I want to enable FTP access to it, but it does not look like I can even give access to the root directory in router's UI, and when I open FTP client, I don't see those files. I have to create a directory ("thedir" in the screenshot below) and place them there. Is this expected?

 

[ColinTaylor]

Is this expected?

Yes, that's the way Asus implemented it.