Problem:

The issue here is that the user wanted to paginate their post slider 1 slide at a time while maintaining 5 slides visible.

Solution:

Unfortunately this isn't possible to do based on how the view pagination works. The view works by loading pages of posts and not the individual post itself.

What I mean by this is that if you have 15 posts and you're displaying 5 posts per page, then you will have 3 pages. Each click will load 5 posts rather than the next immediate post.

Problem:
YouTube video is a white box on the front end

Solution:
User was using "SiteGround Optimizer" plugin, as soon as it's deactivated the video is working just fine.

Relevant Documentation: