I am sorry to say, but you have chosen a wrong plugin here. Our plugin is for post list and we don’t have feature yet for the post gallery. The Lhotse theme you are referring is also list of posts.
However, we liked the idea much and think we need to write for gallery as well. If you can wait, we will incorporate this in our upcoming release. It may take this week based on the development complication.
Please let me know your thoughts.