The album option is available in Gutenberg and Elementor only. The plugin comes with the album block for Gutenberg and album widget for Elementor. You have to use the custom post type GT3 gallery to create the albums.
First, please create the galleries using GT3 gallery custom post type and assign the categories to each gallery. Once it’s ready, please create a page, for example using Elementor and add “Album” widget to the page.
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