How to automatically output listing images in a gallery
How to automatically output the WordPress [gallery] shortcode
When you enable Automatically display image gallery from Dashboard > Easy Property Listings > Settings > Listing Single View; Any images that have been uploaded to the listing using the Add Media button will be output using the default WordPress [gallery] shortcode.
When this setting is enabled your image gallery will be output onto the template using the epl_property_gallery action.
You can check that there are images attached to the listing from Add Media > First Select Drop Down (Uploaded to this post) and your attached images should be displayed.