I read all the replies and question is still unanswered.

I have the exact same problem with WordPress when using nextpage tag to split a single post into multiple pages.

Wordpress SEO plugin from Yoast doesn't handle this.  If I create a blog one post with 3 more pages, url structure looks like the following

www.example.com/post-link/

www.example.com/post-link/1/

www.example.com/post-link/2/

www.example.com/post-link/3/

With Wordpress SEO Plugin, I can set Title and Description for just ONCE ( not for all 4 pages). This results in Duplicate Title Tags.

Possible Solution 1: Re-write Title using wp_title if page is >= 2. Appending page number to the Title could fix this.

Possible Solution 2: Add www.example.com/post-link/ as canonical link in Advanced Tab of Wordpress SEO