We brought a copy of the photos we submitted with original app (although officer told us it wasn't needed since she had that info already) and then 4-5 photos from that point until AOS. In our case, our officer cared more about our wedding picture than anything else. Those were the ones that were saved with our file. Of course we brought electricity, internet, insurance bills, etc, but photos were the heavy weight. Definitely bring photos since you have no clue what your officer is interested in.
FYI we got a senior officer who was notorious for rejecting apps