I installed the latest version of the plugin on my laptop.
No Joy, folks.
Still could not view the target directory.
Downloaded and installed WinSCP, plugged in the same credentials and before you could say instant karma, I was in.
I like the idea of SFTP access from a browser, so I haven't given up on you yet.
Make this work and I promise to donate to the cause.
I'll be back in a few with a screen cap from this laptop for you to look at.