Then start a workflow on file uploader. Set the condition (when the file doesn’t contain .pdf then run that workflow) as shown in the screenshot on the workflow.
thanks you for your method and tutorial, i will try to do it, but seems its a lot of steps
i think i miss something but where u have on "Only When This Fileuploader value "file name " i have :eachfilename because i have list of things and Multi Uploader work with list of Value´s,
i don’t know why the Only when doesn’t work on ;eachfilename it seems not recognize it you know why?