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

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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.

meg@info

BuddyPress Activity Privacy plugin add a privacy level to activity stream component.
The plugin add the ability for members to choose who can read his activity (Anyone, Logged In Users, My Friends, Admins Only, Only me, My Friends in Group , Group Members …etc).
<h4>What’s news In Buddypress Activity Privacy 1.3.x ?</h4>
<ul>
<li>
Admin have abitility to enable/disable FontAwsome icons.
</li>
<li>
Admin have abitility to enable/disable viewing and editing the privacy of all activities.
</li>
<li>
Admin have abitility to enable/disable editing the privacy of posts for all members.
</li>
<li>
Admin have abitility show/hide the privacy label in selexbox.
</li>
<li>
Admin have abitility show/hide the privacy in activity meta.
</li>
<li>
Integration with Buddypress Media plugin (https://wordpress.org/plugins/buddypress-media/).
Make sure to :
<ul>
<li>Set the privacy settings to OFF in rtMedia settings.</li>
<li>A new select-box (Privacy) is added to Edit Media form under Description Textarea.</li>
</ul>
</li>
<li>
The plugin work now on multi site Netowork.
</li>
<li>A New privacy level (@mentioned only). When a member choose this privacy level, only mentioned members (and admin of course) can see the activity.</li>
</ul>
Remark: Members mentioned in activity can see it’s content whatever the privacy level.
<ul>
<li>
New Drop down system with a nice icons (font awsome).
</li>
<li>
Admin Option Area, Admin can update Enable/Disable privacy level, Sort the privacy levels and change the default privacy level.
</li>
</ul>
What’s news In Buddypress Activity Privacy 1.x ?
<ul>
<li>Members can now change the privacy of the activity already posted.</li>
<li>
Admins can update the privacy of all activities.
</li>
<li>
Integration with BuddyPress Follow Plugin (https://wordpress.org/extend/plugins/buddypress-followers/ ).
</li>
<li>
Integration With Buddypress Activity Plus Plugin (https://wordpress.org/extend/plugins/buddypress-activity-plus/ ).
</li>
</ul>
-The plugin is now extensible for new privacy levels !! ( Check the integration of BuddyPress Follow in bp-activity-privacy-integrations.php ).

BuddyPress Activity Privacy

BuddyPress Activity Privacy plugin add a privacy level to activity stream component.

Restrict Media Library Access vs BuddyPress Activity Privacy