After adding video/audio to pages via visual editor & publishing, only the first page or thumbnail and first page is showing. I've checked the footer, changed from Gutenberg to WordPress Classic toolbar. I've redone this one flip book well over 7 times (at least) - working on it for 5 days now. I purchased the pro version hoping to be able to utilize it for the large number of flipbooks I'm needing to create. Frustrated... I'm a newbie and I don't have a clue what to do next.