Can't get custom sidebar to override theme sidebar on posts page

On September 2, someone asked a question indicating they were having the same problem. But it was not resolved (he hasn't responded to further questions yet). So I am asking again here.

I have successfully created and applied multiple custom sidebars, but my posts page (the page I selected in my theme to show my posts) will not be over-riden. No matter what I do it continues to show the theme sidebar.

I am using WP 4.0 and using the Smartline theme by ThemeZee.