3D FlipBook - Print button does not work when accessing PDF from a 2nd website.

I discovered the print button does not work when a PDF file is accessed from a 2nd website. I am using the code below in an htaccess file of the folder on the site where the PDF is stored in order to open it in 3d FlipBook, it works great, but not the print button. Maybe you know of something else that needs to be added to the code here for the print button to work? Thanks.

Header add Access-Control-Allow-Origin "https://mywebsite.com" Header add Access-Control-Allow-Methods "GET" Header add Access-Control-Allow-Headers: "Range" Header add Access-Control-Expose-Headers: "Accept-Ranges, Content-Encoding, Content-Length, Content-Range"