This is a method that I use to embed a PDF directly inside the app. It displays the entire PDF, allows you to scroll through the pages and zoom in and out as needed.
I did try your link which appears to be your domain, which redirects to a google drive link. First of all, your domain does not allow embedding, which is why you get the Forbidden message. When I tried directly with your google drive link, I still had some issues, but after trying some different variations of the google drive links, I was able to get it to work. Google Drive is weird and not always reliable for media storage, but it can work. I would recommend storing media outside of Google Drive. Either with a dedicated hosting service, or directly in Glide’s storage.
Anyway, you can read more about different ways to formulate your url to work with the method used above to embed a PDF.