Is it possible to write code that will display (for selection) all the files within a specific folder WITHOUT manually adding the code to the page

Is there  way for a web page to display the contents of a folder automatically without having to add code each time a new file is available?

  I have an HTML web page that displays a list of PDF files for the viewer to read.  The files are in a Folder by themselves.  Someone who is NOT code savvy can upload the files but is cannot write the code to add the file each time one is added.

Is it possible to write code that will display (for selection) all the files within a specific folder WITHOUT manually adding the code to the page?  If the page shows 4xFiles (which is my starting number), When I add files later is there a way to automatically display the ADDED files.  It would be similar to the DIR in DOS.  Dir and all files display; add files and DIR again and ALL files show.

I can use any help please.  HTML or scripts will be appreciated