Harry - 2012-01-19

There isn't any solution, NppFTP will never check files on its own on a remote server (one of the aims of this plugin was to keep it simple). File reload won't do any good, as this is just reloading the local copy of the file (NppFTP can't override this behavior).
I find this to be too unreliable anyways for a bunch of reasons; you probably know this but I still suggest a revision control system.