Editing Group Images

I did send Sol an email about this, but I also wonder if other group leaders have Uploaded an image for their groups and then decided to change the image. Because I did that for a new group I'm forming and now I've lost the original image I started with and it won't upload the image I was going to change nor will it re-upload the image I originally started with.

So is there something that I'm missing when I'm changing the image? Thanks