OK. I just messed around with this until I figured out how to do it. First, create the vertical stack card for the bubble pop up and then you have to insert custom css to allow it to expand vertically. I only made one so far but I also wanted this since it simplifies everything and is the default interaction anyway. Then create you button or whatever you want to navigate to the pop up bubble card
That seems neat - when I create all looks fine then when I hit done on the page it dissapears - I cant see any visibility restrictions. Perhaps I need to add some button to link to it? Thanks