It seems to me that the limit of photos is 5 MB. One would guess from the instructions that you could load 5 MB photos. I was trying to load 4 photos last week and it wouldn't let me load the 4th one. I added up the total MB of the other 3 and they were a little more than 4MB, which led me to believe the limit is a total of 5 MB per post.
bkay