Hi there, thanks for opening this thread.
As far as I can tell, each item in your feed now features the following block:
<media:content url="https://www.etwired.com/wp-content/uploads/2016/03/blue-dog-on-bike.jpg" type="image/jpeg" medium="image" width="947" height="1214">
<media:title type="plain">
<![CDATA[blue dog on bike]]>
</media:title>
<media:thumbnail url="https://www.etwired.com/wp-content/uploads/2016/03/blue-dog-on-bike-240x170.jpg" width="240" height="170" />
<media:description type="plain">
<![CDATA[]]>
</media:description>
<media:copyright>
Danny Mogle
</media:copyright>
</media:content>
https://gist.github.com/neverything/8c17f33e1fc88af64bd3ee15ff45d94e
Which is in fact the Media RSS element that you are looking for. This can be picked up by RSS readers (but they don’t have too) or for example in Mailchimp RSS to Email campaigns. If you are looking for a way to include the post thumbnail in the content of the feed item, check out https://www.wpbeginner.com/wp-tutorials/how-to-add-post-thumbnail-to-your-wordpress-rss-feeds/
