Hi,
Thank you for purchasing our theme.
1, create the image items(Gallery post): Posts>Add New, set as Gallery format, set a category, set a featured image(shown in the grid list). You don’t need to add content and other options to the posts.
2, install https://wordpress.org/plugins/redirection/ redirect the gallery post URL to the custom URL
3, list the images on a page, Page > add new, set a portfolio template (custom grid portfolio), select the category of Gallery posts. refer to : https://doc.seatheme.net/static/arnold/#pages
video tutorial: https://www.youtube.com/watch?v=TBUbgr0m1Vs&feature=emb_title
Regards!
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