Embedding Problem with Dialogue Cards

My problem is related to Dialogue Cards. I'm using an app called Book Creator to create digital books containing language lessons. Book Creator allows embeds for content created with other apps. In most cases all that is necessary is to grab the embed code for an item you've created in another app, and then paste it into a page in Book Creator. After publishing, when the generated link is clicked, the embed shows up as a pop up window from within the book. However, H5P Dialogue Cards always display in a new browser window. I have tried published to a WP page first with a shortcode, using the URL for the page... whatever I do, the Dialogue Cards open up in a new browser window instead within a book pop up. I could really use some help. One thing that was pointed out to me was [wp-admin] is included in the embed code. Is that a problem? Sorry, not a dev. Thank you.