Thumbnails not visible

Could you please try if the thumbnails are shown if you use the WordPress default theme (twentyfourteen) ?

I’ve tried this but there are still no thumbnails visible. I currently use a Twenty Twelve Child theme for my website.

Is there perhaps a need to use featured images in my blog posts? Because in my website where the tumbnails are not visible I don’t use them. Instead I’ve uploaded a separate image in each of my blog posts.

What I didn’t mention so far is that I have another website running (localy in development) a Twenty Thirteen Child theme where I do use featured images in my blog posts and use your plug-in. After checking the box for displaying images, thumbnails do normally show up in my related posts.

Any further help is appreciated.

Yes, the plugin will display featured images. It should work if you set those.

Is there a workaround in case you don’t set a featured image in your blog posts but still want to display a thumbnail image in your related posts?

Or would this be an option for a future version of your plug-in?

There is no option provided by Related Posts for WordPress to display content images as the featured image of the post. At the moment there are no plans on building this as an option in any future version because I have the feeling this is not something the plugin should do.

Thanks for your feedback though, it’s much appreciated.