It doesn’t automatically add the posts to the products. I tried every setting possible listed in the documentation. I have to manually set the articles, which defeats the purpose considering we have close to 700 products. And the same for showing products on posts, it only shows if it’s manually set. Also regardless of the settings I chose it only shows it in a list format.
The plugin supports automatic similarity search if there is significant similarity in the content or the categorization, and the settings are correct.
For more information, see “What happened if related items don’t appear?” part in the FAQ: