Unique sidebar on each posts

I found the answer to that here: https://www.youtube.com/watch?v=EpJh6dyhKFg

No, that’s not for posts but for pages.

You should be able to by adding this to your functions.php file

function myprefix_init() {
    add_post_type_support( 'post', 'simple-page-sidebars' );
}
add_action( 'init', 'myprefix_init' );

Thank you, thank you! This is EXACTLY what I needed!! ??