Igor Benic

Multisite Featured Image changes the box of the featured image for all sites. It can be used also in a single instance of WordPress and not a MU installation.
This plugin changes the box in the way that the default pop-up is replaced with the classic Media Uploader where you can choose images. Images From URL do work.
For a greater Multisite experience you can combine this plugin with the <a href="https://wordpress.org/plugins/network-shared-media/" rel="ugc">Network Shared Media plugin</a> and have a complete Media Sharing site.
Read about it on this <a href="http://siderrz.com/wordpress-multisite-shared-featured-image/" rel="nofollow ugc">article</a>.
<h4>Features</h4>
<ul>
<li>Using WordPress Media Uploader to set Featured Image</li>
<li>You can set an image from URL</li>
<li>Images from URL will be downloaded into the WordPress Media and it can be used for anything else inside WordPress</li>
<li>Downloaded images are saved in every registered image size </li>
<li>You can set the Main site on which you will download the images in a MU installation</li>
</ul>

Multisite Featured Image

Multisite Featured Image changes the box of the featured image so that you can use the classic Media Uploader also with Network Shared Media.

Freemius

kerosindigital

Add featured images to RSS feeds for Mailchimp, Google News, Feedly and email newsletters. Enhance WordPress RSS feed with thumbnails for better email marketing and syndication.
<h3>RSS Chimp – Add Featured Images to WordPress RSS Feeds for Content Marketing & Marketing Automation</h3>
<a href="https://kerosin.digital/rss-chimp/" rel="nofollow ugc">RSS Chimp</a> automatically adds featured images to WordPress RSS feeds, ensuring compatibility with Mailchimp, Google News, Feedly & automation tools. Perfect for content marketers, bloggers, and businesses looking to enhance RSS feeds for newsletters, syndication & SEO.
This plugin is designed for content marketers, bloggers, and businesses who rely on RSS feeds for newsletters, content syndication, and marketing automation.
RSS Chimp offers maximum compatibility with feed readers and improves the experience of your users who use such programs.
RSS Chimp works instantly after activation and adds blog posts featured images in RSS feeds. It is easily set up and offers advanced users many customizations and settings to customize the RSS feed.
RSS Chimp is forever free and has numerous valuable features despite adding the featured image to the RSS feed. Unlock the premium version and enjoy more powerful features.
<h3>Who Uses RSS Chimp?</h3>
✓ Email Marketers – Enhance Mailchimp RSS campaigns with featured images 
✓ News Publishers – Optimize feeds for Google News & Feedly with thumbnails 
✓ Content Marketers – Improve content syndication with rich media feeds 
✓ Newsletter Creators – Add post thumbnails to automated email newsletters 
✓ Bloggers – Make RSS feeds more engaging with featured images
<h3>Free features</h3>
➜ Add featured images to the RSS feed with the and tag 
➜ Choose between different image sizes to optimize the loading speed and enhance the usability of your WordPress RSS feed 
➜ Include the title and description of featured images in your RSS feed 
➜ Perfectly integrates with Mailchimp, Google News, Sendinblue, MailerLite, Hubspot, and other services for marketing automation and content marketing 
➜ Enable/disable the default WordPress feed 
➜ Validate your feed with a quick link directly from the backend 
➜ Add an image as the logo of your RSS feed, which will be used by feed readers and marketing automation tools, so that users will quickly recognize your site 
➜ Enhance your RSS feed with additional metadata such as copyright information and contact details for the editor or webmaster of the page
<h3>Why Upgrade to RSS Chimp Pro?</h3>
RSS Chimp Pro unlocks advanced features to enhance your WordPress RSS feed:
✔ Create an Additional Custom RSS Feed – Generate separate feeds for different purposes. 
✔ Choose Any Registered Thumbnail Size – Get full control over image sizes in your RSS feed. 
✔ Add Custom Text & HTML Before/After Each Post – Personalize your feed for marketing automation. 
✔ Customize the Permalink of Additional RSS Feed – Set custom URLs for different feeds. 
✔ Define Post Length (Full/Summary) in RSS Feed – Control how much content appears in RSS readers. 
✔ Delay Publication of New Posts in RSS Feed – Schedule post delays for strategic syndication. 
✔ Add URL Parameters to All Post Links – Track traffic sources with UTM tags. 
✔ Hide WordPress Version in RSS Feed for Security – Prevent exposing WordPress version data. 
✔ Premium Email Support – Get fast, priority support for troubleshooting.
🚀 Boost Your RSS Feed with Pro Features! 
🔹 Advanced RSS customization 
🔹 Extra feed control for newsletters & marketing 
🔹 SEO-friendly enhancements
👉 Upgrade to RSS Chimp Pro & Get More Control! 
<a href="https://kerosin.digital/rss-chimp/" rel="nofollow ugc">Upgrade Now</a>
<h4>Support the development of RSS Chimp</h4>
You can support the development of the free version of RSS Chimp and make a contribution on <a href="https://ko-fi.com/kerosindigital" rel="nofollow ugc">Ko-fi</a>.
<a href="https://stories.freepik.com/" rel="noopener nofollow ugc">Illustration by Freepik Stories</a>

RSS Chimp – Add Featured Images to WP RSS Feeds (Mailchimp, Google News, Feedly)

Add featured images to RSS feeds for Mailchimp, Google News, Feedly and email newsletters. Enhance WordPress RSS feed with thumbnails for better email …

Multisite Featured Image vs RSS Chimp – Add Featured Images to WP RSS Feeds (Mailchimp, Google News, Feedly)