First, you need to determine if the photos you want to delete are stored internally (within SiteScope) or if they are located in an export location, such as the photo library on your device. The main screen of the photos tab displays all photo locations under internal/export headings.
Photos in Internal Storage
To delete a photo stored in an internal album, open the album, tap the “Select” button, tap the photos you want to select, and then tap the delete button. Once deleted, photos cannot be recovered.
Photos Stored in an Export Location
Photos stored in an export location (such as the photo library or cloud) cannot be deleted from within SiteScope. You will need to use a different app to delete them, like the Photos app for photo library images or the Files app for cloud photos.