Media Library Assistant Taxonomy not working

I’m using a plugin called Media Library Assistant (MLA Plugin Page) that adds taxonomy to the media library, the taxonomy is called ‘attachment_category’

In the shortcodes builder (Image carousel), it allows me to select the taxonomy from the list and correctly shows the category’s I’ve created, allowing me to select the ones I want, but when I check the preview at the bottom of the builder, or save the shortcode and view the page, it shows “Image Carousel: images not found”

Ths shortcode created is
[su_image_carousel source=”taxonomy: attachment_category/30″ captions=”yes” link=”lightbox” target=”self”]

Any idea how I can use the MLA taxonomy with shortcodes?