We need to achieve following scenario with Image Gallery MVC widget:

1. Go to Module builder and create a module
2. Add a field of type Related media > Images
3. Click Continue to finalize configuring the field
4. For "Display selected items on the frontend using..." choose Images widget and click done
5. Click Finish
6. Activate the module
7. Go and create at least one dynamic content item from the newly created type
8. Type the Title and select several images for Related images field
9. Go to Pages and create a page
10. D&D Dynamic content widget
11. View the page and go in the details of the item

Result: Images are displayed with Image Gallery widget in Lightbox mode