Gallery Showing up blank

I’m using WP-Flow Plus for the first time, the documentation is a bit lacking. I have installed the plug-in, configured it to the best of my knowledge. I’ve tried using it the standard way, as explained on the WP-Flow site, with no success.

Then I’ve added a folder and added three images, added the file structure to the setting, it gives me a result on the settings page. I add that to the text window in a sample page.

The plug-in looks like it is loading (progress bar animates and browser is showing activity, then nothing.

Clearly I’m doing something wrong, just can’t figure it out.

here is the sample page:

https://www.coloradopoolsunlimited.com/wordpress/gallery-test/

Thanks in advance for any assistance

https://www.ads-software.com/plugins/wp-imageflow2/