Why can't I download my newly created PDFs?

In the last few days I cannot do anything with the PDFs that I am creating.  Creating the documents from word or powerpoint is fine, i can even merge several PDFs into one new PDF but I cannot do anything with the resulting file other than view.  The download button doesn't work and the share file link just produces an error message.  It's a pretty useless piece of software if you can't do anything with the end product