Pics have to be less than 10MB in size. That's often why I get an error message so I reduce the pic size to an acceptable level. I always add pics from my "Photos" ~~ I always use the link on left hand side of My Page then click on "Add" at top because I sometimes get an error if I use the other link - "Photos" at the top under "Latest Activity" heading. I hope that helps.
Thanks Dennis. I'll check the file size. My camera is set to take pictures at the highest quality setting, so that may be it.