When you access the WebDMS and the field Show download link is active, the table shows the field Download at the end of each row.
This field offers the possibility to download the currently active document as PDF file. To be able to download a PDF file the function Create PDF files need not necessarily have been activated. One can create a PDF file ad hoc. However, if you want PDF creation to happen automatically and constantly in the background and if you want searchable PDFs you must not only tick the box Create PDF files but also Show download link.