I’ve created a slider (post-based slider with max 7 posts and current posts are 2 posts) and I needed to display a gif image before slider so I decided to add one slide to display the gif. The result is the gif is displayed but the post-based slider only display one slider.
From the attachment: first is from slider editor and second is from slider setting
Oh, I’ve move the site to main domain: kanaan.sch.id 🙂
I have duplicated the second layer and now the slider is showing all three posts that you have. When you have a slider getting it’s content from a post type, you cannot have a custom slide within that slider. So I would suggest you delete the first slide and just show the posts from News custom post type.
From your solution, I realized something. From 3 posts I published, only 2 post displayed. Therefore I add a post which I set to be published at year 2001 ( so it always be first post) then all newest post would be displayed at slider correctly.