Roku

<p>This plugin makes uploaded files only accessible by logged-in users.</p>


Uploads Protector

This plugin makes uploaded files only accessible by logged-in users.

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.

Uploads Protector vs WP Sanitize File Name Plus