PDF writer didn't work because I couldn't get it to write using Binary.However I did receive a response from support indicated that I need to set the MIME type in my Writer to application/pdf.This finally fixed my issue.It wasn't a predefined option from the list so I didn't think about typing it manually.
I can't download your workspace for some reason so I can't really check what you have done.
I suspect the problem is with the DataFile writer, can you try the regular PDF writer?