Don't require a directory
I'm using an embedded Linux box (it's a media player), and it's FTP server is very dumb... it borks at ~/ and ./ and everything else I can think or to put in directory.
I just want the file to be delivered to the default directory that's set when the client connects.
I assume you already tried leaving the directory blank? What FTP software/version are you running?
Leaving the directory blank: the bookmark shows up as ftp://192.168.10.60/(null), and gives a directory not found error.
The FTP server is (I believe) a custom one that the manufacturer wrote. It is very temperamental... including not allowing more than one connection.