Hi Andy,
To add images to the Photo Gallery
Add some photo from Photo Gallery -> Add New
Go to Appearance » Theme Options » Sections » Section 8
Use this shortcode to display photo gallery: [photogallery filter=”true” show=”8″]
Please check the documentation to customize the Photo Gallery
https://www.gracethemes.com/documentation/beautiplus-doc/#photo-gallery
Regards
Grace Themes