How to get the "read more" prompt when I embed a Spark page

Hi @Amitej S thanks for responding. Here's a screenshot of an older embedded spark page, displaying the "read more" button, prompting my students to click on it it also has a slight animation effect when you hover over it.

The second example appears as a static image, with no "read more" button or animation. (I've had to add text above for students to know to click through)

It seems to happen with pages that I have edited more recently (last 6 months or so)

The workflow has been the same for both examples:

Click "Share" button

>Publish and Share link

>Embed

I then copy the embed code into the html of the Moodle page.

I've tried tinkering with some of the variables in "publish options" on the publish and share page with mixed success. If I hadn't given the page a title already, adding a title and adding my author attribution worked and the "read more"appeared when I refreshed my moodle page. However pages that aleady had titles in the 'publish options' area didn't respond to this. 

Any help would be appreciated! 

Thanks!