Alvaro Gómez

This plugin restricts access for Authors and Contributors so they can only see their own Media Library uploads.
This has two main uses: Make it easier for Authors to locate their own uploads when Media Libraries grow very big and prevent Authors from using or downloading media that belongs to other users.
Admins and Editors will still be able to see everyone’s uploads.

Restrict Media Library Access

Muy útil

This plugin works fine in WP 5.7.1 

It's just the example code from the official WP docs for the ajax_query_attachments_args filter, with a line added to check if the current user is an administrator. It's very simple.

There's no reason this plugin shouldn't work in an up-to-date WP installation

works in WP 5.7.1

Restricts access for Authors and Contributors so they can only see their own Media Library uploads.

Hossni Mubarak

HM Plugin

This <a href="https://hmplugin.com" rel="nofollow ugc">HM Multiple Roles</a> plugin provides a user interface and allows you to select multiple roles for a user.
It hides the default role dropdown list and displays a list of role checkboxes for both new user and update user page.
Multiple roles can be visible from the All User list page.
 How to use it: 
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/Kw4R8B1cV5s?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
🌟 Plugin Features:
<ul>
<li>Easy to install and use</li>
<li>Fully integrated in wordpress</li>
<li>Select multiple roles</li>
<li>No extra settings required</li>
</ul>
👍 Feedback/Rating: 
If you find this plugin helpful, feel free to give us your valuable review. Rate us and share this plugin with your friends and others. This will motivate us and help us to grow. 
<a href="https://wordpress.org/support/plugin/hm-multiple-roles/reviews/#new-post" rel="ugc">Rate Us</a>
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👉 <a href="https://wordpress.org/plugins/hm-multiple-roles/" rel="ugc">HM Multiple Roles</a> Select multiple roles for a user

HM Multiple Roles

It hides the default role dropdown list and displays a list of role checkboxes to select multiple roles for a user.

Restrict Media Library Access vs HM Multiple Roles