rss image – how to show

Hello,

My home page is https://nepalese.co/ and this page have rss from many other website like https://doc.nepalese.co/ , https://movie.nepalese.co/

When I am using rss from other websites, I get list of recent post but dont get thumbnail from those post of different websites.

For example, on my main site https://nepalese.co/, left side bar have rss from https://doc.nepalese.co/ but without thumbnails.

I am using highly customized theme.

Any one could you please have look on https://nepalese.co/ and suggest me how, can I get post with thumbnail using rss on the main website.

Thanks.

Jay