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The website is already live and running on ZenCart v1.3.9h (Italian installation, with English files) and with a custom made template.
There are also some AddOns, all of them from the community (list available upon request, but nothing very strange).
I would need to give my customers the chance to be able to download the PDF file of the invoice of any past order from their Orders History page.
BUT for accounting needs the PDF files are built up from another system when the goods leave the stock, so I would only be able to UPLOAD them in a specific folder, following a filename pattern (to be decided), and this should make the file appear in the customers' Orders History page as a button (something like "PDF Invoice download").