If anyone else is wondering about this, I received this info from the Smartcat Support:
“Hi there
If you’re using multiple galleries, you’ll want to use a shortcode instead of the Gallery template option.
Paste this shortcode into the page.
[athena-gallery gallery=”slug” count=”30″]
The slug is the title of your gallery. Count is the number of images you want to appear.
Thanks !
Smartcat Support ”