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

aviplugins.com

<ul>
<li>This plugin will allow you to upload files to your post or pages or any other custom post types.</li>
<li>You can eather use shortcodes or functions to display attachments. </li>
<li>just install the plugin and update setting from <code>Settings-> Custom Post Type Attachment</code>. </li>
<li>Upload files in your post/page edit page.</li>
<li>Display files in frontend using shortcodes or using custom functions.</li>
</ul>
<h4>Usage</h4>
<ul>
<li>Display all attachments with a single shortcode [pdf_all_attachments]</li>
<li>Display Single attachment [pdf_attachment file=”file_number” name=”optional file_name”]</li>
<li>Example: [pdf_attachment file=”1″ name=”PDF File 1″]</li>
<li>Or</li>
<li>pdf_attachment_file(“file_number”,”optional file_name”);</li>
<li>Example: <?php echo pdf_attachment_file("1","PDF File 1"); ?></li>
</ul>
<h4>Custom Post Type Attachment PRO</h4>
There is a PRO version of this plugin that supports unlimited files to upload with multiple file types. You can get it <a href="https://www.aviplugins.com/custom-post-type-attachment-pro/" rel="nofollow ugc">here</a> in USD 1.50
<ul>
<li>Attachment number can be Increased / Decreased from the post edit page. You can upload other type of files also. Supported files that can be uploaded are PDF, TXT, JPG, JPEG, BMP, GIF, PNG, DOC, DOCX, XLS, CSV, PPT, PPTX, ZIP.</li>
<li>Every file can be marked as Hidden. These files will be hidden from visitors of the site. Only Logged In users will be able to download these files. For others a message will be displayed in place of the hidden files. This message can be updated from admin panel.</li>
<li>You can select the user types that you want to give Permission to be able download the attachment files. Only selected user types will have permission to download the attachments.</li>
<li>More Advanced File Download feature.</li>
<li>Users can be asked to enter basic details like Name, Email & Phone Number before they can download the Attachments.</li>
<li>Files Attachment option can be enabled in the WordPress default comments section as well.</li>
<li>Files can be embedded in the page content. Users can view the content of the file before download.</li>
<li>Supported document files that can be embedded are Adobe Acrobat (PDF), Microsoft Word (DOC), Microsoft PowerPoint (PPT), Microsoft Excel (XLS) 
<a href="https://www.aviplugins.com/custom-post-type-attachment-pro/" rel="nofollow ugc">Click here to find out in details</a></li>
</ul>
<blockquote>
Post your plugin related queries at <a href="https://www.aviplugins.com/support.php" rel="nofollow ugc">https://www.aviplugins.com/support.php</a>
</blockquote>

Custom Post Type Attachment

This plugin will allow you to upload files to your post or pages or any other custom post types.

MCM Protected File View vs Custom Post Type Attachment