Well, I deleted the current picture, uploaded a new one... and the old one reappeared! WTF? So, I deleted it, again... And uploaded a different one, again... But then only the old one still appears! I try to add multiple pictures, but I can only see the original one, no matter how many or how many times I try to upload a new one(s). Strange, hey? Any ideas?
Yes! You have the old version of the picture in your local browser cache. Go to your vehicle profile page and do a hard refresh, usually that's Ctrl + Shift + R, but it depends on your browser. Here's a good article with instructions for bypassing your cache in different browsers.