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Hi,
For that URL to work there needs to be the flipbook on that page.
That link actually open the existing flipbook on the page.
Example: https://dearflip.com/flipbook-examples/#flipbook-df_378/5/ is opening the second flipbook(lightbox) on that page, directly. If that flipbook is not there, nothing will open.
Plus that link works when you are opening the page from some where else, not when you are on the same page.
Best Regards,
DearHive