Jon Dingman

Video Thumbnail Auto-Feature

Plugin will grab a thumbnail from the video you embedded, download it, then set it as the featured image.

Delight Star Inc.

Jun'ya Hirano

Satoshi Maehira

Multiple Images Field is a plugin to add a filed that allows you to set multiple images to posts screen.
It becomes available by making the following settings from “Settings” and writing the function for Multiple Images Field on the theme template.
<ul>
<li>Enabled post types</li>
<li>Maximum image count</li>
<li>Whether to register the first image as a featured image.</li>
</ul>
Refer to the following help page for the use of functions. 
<a href="https://github.com/delight-star/multiple-images-field/wiki/How-to-Use" rel="nofollow ugc">https://github.com/delight-star/multiple-images-field/wiki/How-to-Use</a>

Multiple Images Field

Add a field for setting multiple images to posts screen.

Video Thumbnail Auto-Feature vs Multiple Images Field