Create a new “Site Layout” master page that shows up on the “Change the look” page?

Question

Right now when I go to "Site settings" > "Look and Feel" > "Change the look" > select a theme I only see two options in the "Site layout" drop-down: Seattle and Oslo. I created a copy of the Oslo master page on my site but it does not show up in the list. How can I get it to show up?

Answer 1

I cross posted on MSDN and got my answer there.

https://social.msdn.microsoft.com/Forums/en-US/84b6a33c-c45f-4b6f-802d-1bab78ae9818/create-a-new-site-layout-master-page-that-shows-up-on-the-change-the-look-page

You have to make sure there is a .master and .preview file.