Titles and captions for featured image on posts and pages

Hello Vlad,
What do I need to change to make a featured image on a post or page show a caption and / or mouseover title?
Thanks for the help!

Hello,

Featured images cannot have captions by default, that’s how Wordpress does it. You can try a plugin, like this one, and see if you can achieve this.

FYI as of this posting this plugin doesn’t work with WP 4.4.2 and Sydney.