3D FlipBook - Show/Hide flipbook

Hey, I have a flipbook shortcode on my page which is hidden via css (display: none) and a form they must fill in before it's shown.

When the form is submitted the class is changed to display block, but the pdf does not show? I can see the controls but there is no pdf and the area the pdf displays in is really short. almost as if it didn't load anything.

Is there a way to reload a pdf on the screen via javascript (with the wordpress plugin)?