Problem:
By default, WordPress does not include the featured image in the RSS feed of your posts.
Solution:
Add this snippet of code to your functions.php or a mu-plugin. The below code uses the ‘large’ format image of the file saved as the featured image for the post.
function featuredIMGtoRSS($content) { global $post; if ( has_post_thumbnail( $post->ID ) ){ $content = '<div>' . get_the_post_thumbnail( $post->ID, 'large', array( 'style' => 'margin-bottom: 15px;' ) ) . '</div>' . $content; } return $content; } add_filter('the_excerpt_rss', 'featuredIMGtoRSS'); add_filter('the_content_feed', 'featuredIMGtoRSS');