Web-Viewer does not add continuation pages(dynamic new pages)

I am using one of the fda forms(FDA 1572) found here Clinical Trial Forms | FDA, which has a dynamic add-extra-page button, which should add extra pages. It works on adobe reader but does not work on pdfjs express webviewer. This is the error I get when I click the button :

Embedded JS error encountered, Mouse Up event on Field: ReferenceError: AddPage is not defined
// VCK 5/26/13
//
// Continuation button for section 3 spawns T3-1.
// Don’t add a page 3 if it has already been added.

Hi @vazearchis

Unfortunately PDFjs Express does not support page manipulation.

Best Regards,
Zach Serviss
Web Development Support Engineer
PDFTron Systems, Inc.

Thanks for your response! Is this a feature that is currently in the works? Or would we have to use adobe software to use page addition?

No page manipulation is not a feature we are working on. Please continue to use Adobe if that works with the FDA document.

Best Regards,
Zach Serviss
Web Development Support Engineer
PDFTron Systems, Inc.