iporter

<p>By default, WordPress doesn’t allow for categorising attachments – just posts.  This plugin adds a category selection field to the attachment management interface.</p>


Media Categories

By default, Wordpress doesn't allow for categorising attachments - just posts.  This plugin adds a category selection field to the attachment man …

Yslo

<p>Empty spaces and special characters can create some problems.</p>
<h4>Features</h4>
<ul>
<li>Improved default function <a href="https://codex.wordpress.org/Function_Reference/sanitize_file_name" rel="nofollow ugc">sanitize_file_name()</a></li>
<li>Remove latin special characters used in file name</li>
<li>Make file name lowercase</li>
</ul>


WP Sanitize File Name Plus

Sanitize file names and enhance security.

Media Categories vs WP Sanitize File Name Plus