I know there have been numerous recommendations to upload pictures to hosting sites. But all I did was resize my chosen picture to just under the required size, keeping perspective, and uploaded it. And it worked.
My Avatar was originally uploaded from a computer with a Windows OS. Since I am now using a Mac, I will probably not be changing it until I learn more about this machine.
"Churches may close and old shepherds may die, but the herd will always be the herd."