If you receive an error message telling you the file is too large, there are a few ways to fix it.
1) Change the camera settings on your phone to a lower quality/smaller size. This obviously won't help you unless you can retake the picture or you are planning ahead and change your settings first.
2) Download a free photo-resizing app (or your phone may have an editor already, but I've found those aren't typically user friendly).
3) My favorite....just pull the picture up on your phone. Turn your phone sideways, if necessary, to get rid of toolbars and such...or to simply display the pic how you want it. Take a screenshot. Save screenshot to your phone and use that screenshot to upload your image. A screenshot reduces the file size.
I hope this helps some of you. If any of you want to add tips or tricks or any info I may have left out, feel free to do so!