Can I import feed from a wordpress site using atom feed?

I have setup the autoblog plugin on a site I am developing using the multisite platform. The feed I am having problems with pulls from a wordpress site outside of the multisite network using atom feed. AutoBlog will import a new post from the other site (I tested with simple text post) but is not pulling my older posts (they have featured images and video links). I am wondering if there is something I am missing in the setup. The site I am developing is a template for agents and I will want to have the option to import the posts from the site not in the multisite network. Any help is greatly appreciated.