Widgets

You can insert gallery widget in WYSIWYG editor or using Content > Widgets page.

You can choose between two gallery layouts:

Default Magento Gallery:

Masonry Grid Gallery:

Template - select the look of the gallery: default Magento or masonry grid layout
Image Width/Height - set main gallery image size
Thumbnail Width/Height - set thumbnail image size
Images - upload gallery images. You can upload multiple images at once. To assign image alt text, click on uploaded image thumbnail. To change image order, drag image to new position.