Use image in post as thumbnail - continuing a closed thread

This is a continuation of Use image in post as thumbnail

@littlelettuce, I want to do exactly what I believe you have done

get ghost to take the first image in the post and use that as the thumbnail … get that to show up in the post teaser

You said your solution was to:

I used {{content}} within the post teaser partial and it will show the image, so I don’t have to upload the same image as a thumbnail to show in the archive page.

What exactly do you mean by that? Is that a theme modification?

Is that to say I need to add {{content}} somewhere in post-card.hbs… perhaps on line 13?