mcmwebsol

Protects uploaded files so they can only be viewed by logged-in users
This plugin does not work with the media library. It only protects files uploaded through the plugin itself.
Requires a web server that supports .htaccess files for access control, such as Apache on Linux. Please note that even Apache on Linux 
disables .htaccess files in newer versions in some configurations, so please check to make sure your files aren’t publicly accessible. 
You can test that your files are protected by using the wp-content/uploads/ path or 
 by using the “Test link security” link on the “List all protected uploads” page. You should receive a 403 Forbidden error 
 if it’s working correctly.
This plugin does not collect any private data itself though it’s possible logged-in users may upload private data to your website using this plugin.
PRO SUPPORT 
While we attempt to provide basic support for this plugin here on the WordPress.org forums, for advanced or priority support please use the pro version. 
The <a href="https://www.mcmwebsite.com/mcm-protected-file-view-pro/" rel="nofollow ugc">pro version</a> also adds per user role file permissions, so, for instance, you can have a file that’s only accessible to a premium role, while not accessible to a basic role.

MCM Protected File View

Protects uploaded files so they can only be viewed by logged-in users

lenasterg

BP Group Documents creates a page within each BuddyPress group to upload and any type of file or document. This allows members of BuddyPress groups to upload and store files and documents that are relevant to the group.
Documents can be edited and deleted either by the document owner or by the group administrator. 
Categories can be used to organize documents. 
Activity is logged in the main activity stream, and is also tied to the user and group activity streams. 
The site administrator can set filters on file extensions, set display options. 
Group members and moderators can receive email notifications at their option. 
The group administrator can decide if all members or only admins/moderators can upload documents (Since v0.5) 
User verification for Downloads: when a document is downloaded, a redirect page checks is the user is member of the group (in case of a private or hidden groups) and only then the user can download the file.(Since v0.5) 
For private networks, see the FAQ “I have a members only network. How to disable file download for non members?” .
4 Widgets: “User’s groups documents”, “Recent Uploads” , “Popular Downloads”, can be used to show activity at a glance. If the theme support different sidebars for group pages, the BP_Group_Documents_CurrentGroup_Widget can be used to show current group’s documents.
Contributions by Lena Stergatou, with additional bug fixes and improvements by Keeble Smith (http://keeblesmith.com) and Anton Andreasson work for BP 1.7.
Original plugin author was Peter Anselmo.
PLEASE: If you have any issues or it doesn’t work for you, please report in support forum. It doesn’t help anyone to mark “broken” without asking around. Thanks!
<h3>Notes</h3>
Roadmap.txt – contains ideas proposed and the (approximate) order of implementation
History.txt – contains all the changes since version .1
License.txt – contains the licensing details for this component.

BP Group Documents

Great functionality, and good notifications!

This is the plugin every buddypress user should have

BP Group Documents creates a page within each BuddyPress group to upload and any type of file or document.

MCM Protected File View vs BP Group Documents