Getting Thumbnail in fetch_feed from custom field

According to the Codex, fetch_feed() uses the SimplePie engine for parsing RSS.

So, if $item->get_title(); is working, then you should be able to do:

$item->get_thumbnail();

as per the SimplePie documentation, as long as there are any thumbnails already on the feed.

UPDATE:

Before running the above, you have to insert the images on your feed. Check for display featured image in RSS feed and How to grab first image attached to post and display in RSS feed? topics on it.

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