As mentioned, the dropbox solution doesn’t really cater for tighter integration to the website, like generation of navigation menus based on series titles etc and extracting the body. Of course dropbox could be used as an intermediate stageing in that process but is an unnecessary step.
I did assume that perhaps the ‘application’ option might add a temporary file and I did investigate that but for some reason couldn’t get the filename as an input parameter, it might have been because I need to send two parameters, destination filename and the temp file. Clearly that would be the simplest solution to call an application to do the transfer.
e.g. myapp.cmd /path/dest ( and implied temp file as the second parameter
whrere myapp.cmd contains something like
winscp.com /command "open scp://user:password@example.com/" "put %2% %1%" "exit"