By default, RSS won’t display. You have to use RSS2. However this will help you. Paste it in your functions.php:
function insert_thumbnail_into_feed() {
global $post;
if ( has_post_thumbnail( $post->ID ) ){
// replace thumbnail with yours
$content="<p>" .get_the_post_thumbnail( $post->ID, 'thumbnail' ) .'</p>';
}
// get post content and replace feed content with
// you can also limit/filter the content to exclude shortcodes and HTML code etc.
$content .= '<p>' .get_the_content() .'</p>';
return $content;
}
add_filter( 'the_excerpt_rss', 'insert_thumbnail_into_feed' );
add_filter( 'the_content_feed', 'insert_thumbnail_into_feed' );
Hope it helps.
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