Once you get it working it’s brilliant.

I found that it didn’t work straight out of the box and there’s some important instructions missing. It looks as though the plugin is supposed to add section settings automatically but it doesn’t for some reason.

But I found the fix to be very simple. After you’ve added the popupID on the popup tab of the section, go to the Advanced tab of the section. Add the same popupID as the CSS ID. Then make the CSS Class ‘popup’ (without quotes). Save the section and that completes step 2 from the plugin instructions. Then complete step 3 and it works a treat.