Native Gutenberg Tiled Gallery
Classic Editor Gallery
The current site is using the Gutenberg Editor by default. WordPress has evolved the Gallery option for Gutenberg. However the plugin WoowBox uses the legacy “” Shortcode.
In order to add a new one in Gutenberg. Simply add a Classic Editor Block. And then in that block using the text editor add the “” short-code, flip back to visual, and then edit the gallery just created to add images to it.