Is there no supporting documentation for the Services shipped with Workbench? (generatePDFOutput in

I'm trying to build a process that saves a form (as completed by a user) to the server's file system. The generatePDFOutput Service isn't working (runs forever) and the help pages do nothing much more than list the property fields names. Surely it isn't uncommon to want to save a copy of the form before or when the process completes?

Any and all help is welcome!