See the demo site

Displays one or more images in a lightbox

with adaptation of the image size to the device and legends
syntax 1 {up image-gallery=images/image.jpg | alt=text}
syntax 2 {up image-gallery=path folder}
syntax 3 {up image-gallery} content with images{/up image-gallery}

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legend configuration (type and style)

to offer the high-definition download of the image

style of pictures

main block style

fluid grid mode with search and classification by subfolders

Progressive loading mode

responsive configuration. adapted image settings (srcset)

storage folder for size variants for images (to be put in custom/prefset.ini)