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.

irenem

A simple tool that allows you to switch between user accounts without the hassle of logging in/out. It allows you to view, review and do what yours does to your site.
<h4>Features</h4>
<ul>
<li>
Switch between user account and to guest user.
</li>
<li>
Inherit all capabilities of the selected account, as if you are that very same user.
</li>
<li>
Helpful for developers, designers, and site owners.
</li>
</ul>

User Switcher

This plugin helps me very much when I need to test custom user roles.

I like it

This is really helpful plugin for testing my user's issue with my site. When I have only admin account I can easily switch to a random users and reproduce their issue. Thanks for the great solution.

Perfect tool for testing users issue

A helper tool to help you switch between user account without logging in and out.

Restrict Media Library Access vs User Switcher