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.

FuzzGuard

This plugin allows you to display menu items based on if a user is logged in, logged out or based on the role you have given the user.
This plugin allows fine-grained permissions to be added to each individual menu item to display or not display the item based on the 
 users logged in/logged out status or the role assigned to the user. This solves the problem of having to modify theme functions.php files to add in menu restrictions. The changes in functions.php is often overwritten by a theme update. This plugin removes that worry, as you can update the theme, independent of the plugin.
<h4>Please Note</h4>
This plugin uses a modified version of the Nav Menu Walker class. This means any other plugins that utilize their own custom Nav Menu Walker class, can and will conflict with this plugin. WordPress developers have support for proper custom hooks in this area of the Admin Menu slated for v4.8 release. Please see FAQ item “I cannot see the options for Privilege Menu under menu items in the Admin Panel?” for more information.

Privilege Menu

This plugin allows you to display menu items based on if a user is logged in, logged out or based on the role you have given the user.

Restrict Media Library Access vs Privilege Menu