This plugin allows to set a featured image for each category. 
Posts without a featured image set will show the category’s featured image instead. 
Featured images usually are placed by the theme in the single post page, in the latest posts page, etc. 
But can also be shown using the shortcode [cfi_featured_image] or the PHP function cfi_featured_image(). To get the featured image URL I added the function cfi_featured_image_url().
Shortcode/PHP function optional arguments:
<ul>
<li>‘size’: ‘thumbnail’, ‘medium’, ‘large’, ‘full’</li>
<li>‘class’: class of the image tag</li>
<li>‘alt’: alternative text of the image tag</li>
<li>‘title’: title of the image tag</li>
<li>‘cat_id’: select a specific category id</li>
</ul>
Shortcode example:
<pre><code>[cfi_featured_image size="large" title="This is a test..." class="my-image" alt="My image"]
</code></pre>
Function example 1:
<pre><code>cfi_featured_image( array( 'size' => 'large', 'title' => 'This is a test...', 'class' => 'my-image', 'alt' => 'My image' ) );
</code></pre>
Function example 2:
<pre><code>cfi_featured_image_url( array( 'size' => 'large' ) );
</code></pre>
Notes:
<ul>
<li>If a post has more than a category with a featured image the first available is loaded</li>
<li>If a category hasn’t a featured image but it has a parent category with a featured image the parent one is loaded</li>
</ul>

Category Featured Images

This plugin does one thing and it does it well.
It's easy to use, too: install, set up the default category images and forget about it.



Does one thing and does it well

Set a featured image for all the posts of a category.

jeffrey-wp

Adds the ability to use categories in the WordPress Media Library. When activated a dropdown of categories will show up in the media library. 
You can change / add / remove the category of multiple items at once with bulk actions. 
There is even an option to filter on categories when using the gallery shortcode.
<h4>Features WordPress Media Library Categories</h4>
<ul>
<li>add / edit / remove categories from media items</li>
<li>change the category of multiple items at once with bulk actions</li>
<li>category options & management in the Media Library</li>
<li>filter on categories in the media library</li>
<li>filter on categories in the gallery shortcode</li>
<li>taxonomy filter</li>
<li>support for WordPress 4.0 – 6.8</li>
</ul>
<blockquote>
Try Premium version – 100% money back guarantee 
 WordPress Media Library Categories Premium adds the option to filter on categories when inserting media into a post or page. 
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</blockquote>

Media Library Categories

When edition a page in classic or new block system you never see a preview , it's always no items found.


On the visitor site their is no issue (for now)

BUG? in editor you always see no items found

Adds the ability to use categories in the media library.

Category Featured Images vs Media Library Categories