timmcdaniels

WordPress plugin that adds a metabox to posts, pages, and custom post types where you can select if the content requires a login and what role is allowed to view the content. The native auth_redirect function is used to redirect users to the login page.

Simple Require Login

Require login for content on a per page/post/custom post type basis. You can also select a specific role required to view the content.

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.

Simple Require Login vs Restrict Media Library Access