Automatically sets the featured image (previously named post thumbnail) to the first uploaded image into the post. So easy like that...
Checks if you defined the featured image (previously named post thumbnail), and if not it sets the featured image to the first uploaded image into that post. So easy like that...
It does his job in two cases:
Dinamically, for old published posts, the featured images are sets only when needed to show them in the frontend. This means that the featured image is set (only first time) when a visitor loads the page where it needs to be shown.
For new posts, it sets the featured image just in the publishing process.
No options page to setup, simply install and activate.
The plugin uses only WordPress standard functions to set the featured image (just the same as you set it manually). And this requires to have attached/uploaded at least one image into the post. If there's not any image attached to the post, this plugin can't help you.