If you are loading them from a computer, then the easiest I have found is to upload them to a separate site like flikr or photobucket and then just copy and paste. I can't help if you are trying it from a mobile device.
As for the spot on her back, it is entirely possible that it's a melanoma. My gray horse has one on his back about 4 inches back from his withers and maybe 4 inches down from his spine, just about where the bars to the saddle land. I plan to have it surgically removed (along with 2 more from his face) this winter after the flies are dead. I've already had 2 taken off his butt in the past.
Unfortunately, that's just the curse of the gray horse. Most of them will end up with melanomas somewhere at some point in their life.