In the right hand menu you can see all media (posts and stories) that were published within the campaign.
By default all posts are filtered out by most recent ones. You can also switch to the oldest ones and filter them out by most/least engaging and best/worse CPE.
Additionally, please note that you can extend Media section to the full screen mode by clicking on the orange arrow. This might be useful in case if you have a large number of posts at your campaign.