如何在Wordpress中存储与原始帖子相关的图像？

I have 2 images that are associated with a post and can't figure out how Wordpress connects them to the post.

Here's the wp_posts table. The post has an post_id=3378 and the two images are post_id=3418 and post_id=3918.

I think it's through the inherit property but that key word isn't unique in this table. Sorry I'm new to WP, any help would be appreciated.