For anyone trying to create categories for the menu, I just figured it out.
Go to the Gallery Ape plugin and select “New Gallery” from the menu.
Add images by going to the green button “Gallery Resources” at the top right of the page.
Add a title and for the gallery. (This will be the first category name for your gallery menu.)
Set the style preferences.
On right column there’s a section called Page Attributes. Select “(no parent)” meaning this will be the main gallery.
Click Publish
Go to the top of the page and click “new gallery”
Add images, title, and this time on the page attributes select the title of the first gallery you made.
Click Publish
Repeat to add more categories to the menu.
Cheers!
