Same issue. This is how you fix (or get around it) at least on IPhone anyway. Get the TAPATALK App. That App hosts the AG forum. When you get the App and go to upload a pic, it will ask you if you want to use TAPATALK as the picture "host". Choose "yes". It costs a one time fee of 99 cents if I recall. No more picture issues.
Uploaded pic using TAPATALK
Oh and while we are at it, the AG Store part of the AG App desperately needs a "back" button. I place orders on my iPhone from AG all the time, but I use the full site. If you want to look at say, SF4500 Polish, and click on it, you need to go all the way back to "exterior car care" and drill down the line again to look at a different polish - it's really time consuming, when with a "back" button you could just go back to the previous "polishes" screen. Anyone else notice this????