Attachments with Lightbox
The Attachments with Lightbox web part displays a gallery of unsorted attachments of a specified document. After clicking an image in the gallery, it is opened in full size in a lightbox. The web part is useful when you need to display a gallery of images related to a single document, typically the currently displayed one.
More information about document attachments in Kentico CMS can be found in Kentico CMS Developer's Guide -> Content management -> File management -> Document attachments.