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.

Pitabas

NetTantra

This plugin asks the user to choose his role in the website during registration from a list of selected roles. It works with BuddyPress also. It provides an interface from where the admin can choose which roles to display during registration for the user to choose from.
<h4>About the Developer</h4>
This Plugin is developed by NetTantra Technologies – a team of open-source enthusiasts and WordPress experts. NetTantra designers and developers work relentlessly to bring code to life so that WordPress users don’t have to do the hard work.
For professional support, you can get in touch with the NetTantra Team at <a href="mailto:wordpress@nettantra.com" rel="nofollow ugc">wordpress@nettantra.com</a>

WP Roles at Registration

This plugin asks the user to choose his role in the website during registration from a list of selected roles. Works with BuddyPress also.

Restrict Media Library Access vs WP Roles at Registration