How to add a button on a form with an advanced PDF link
can you elaborate a bit, you should bale to that using a workflow – add button and open record or navigation workflow action. Other option is to use a script. By any chance you are you trying to show a button for printing instead of action link? Then just go to the form and change the print action type to button.
Try this to help find your solution: https://stackoverflow.com/questions/56165306/add-a-print-button-to-vendor-credits-view-mode-with-advanced-pdf-template-in-n