I think you may be confusing the input properties defined on the GeneratePDFService (CreatePDF2) in the Workbench with the endpoint configuration done in the Admin UI.
One way to access the endpoint configuration is Home > Services > Applications and Services > Service Management. Filter on the category PDF Generator and click on GeneratePDFService:1.1. Click on the Endpoint s tab, select WatchedFolder in the drop-down, and click Add.
I solved the problem.
filename (variable) in the configuration of wached folder in Adminui should not be *.*
It has to be (.txt, .doc) and so on for every extension.