Cannot see PDF book loading in viewport

I’m using a plugin called “Real 3D Flipbook” and am running into an issue. When a user is loading the catalog on a tablet or mobile device, the book loads above the viewport and the user cannot tell if the catalog is loading or not.

For example, if I scroll down this page and click on the catalog button, you cannot see the catalog loading unless you scroll above what you are currently viewing to see the scrolling image.

I’ve contacted the developer three times and no response on how to fix this issue.

Does someone have an idea on how this can be fixed?

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