This is really sweet, but if I may, what's wrong with using existing solutions like Dropbox or Google Docs? Neither shows a paywall or login screen when accessing the shared links.
Unless you don't use either service, which is totally valid.
Unless you don't use either service, which is totally valid.
Will PDFy submit lists of content to search engines or be easily crawlable?
EDIT: And both are more involved than just dragging and dropping a PDF.