Manage files on the server?

I am making a server using NodeJS and Express and in it I am generating pdfs of reports. How do I manage these files, and when I talk to manage I mean having options like opening the pdf, downloading it and printing it. I am using the pdfMake library however it has bugs in that part of downloading, opening or printing the document. And if possible I intend to continue using this library for generating pdfs because of its ease of use. So, my question is: How can I create the open (), print () and download () methods manually? If so, how do I do it ???