How to get featured image?

hi,
I just started to work with autoblog plugin, but there is one thing that i wanted to ask!
I have a multisite:
mainsite,
subsite,
subsite,
etc.
(all sites are on wordpress base)
I want to get feeds from subsites and post in main sites! Everything works perfect except Autoblog doesn't get subsites posts featured images!
Autoblog gets images which are in post, but not featured image, is there some possibility to get featured images or what do i need to change to get these images?