He may be having trouble finding his image. I load my photos into Photos on the MAC and from there I export the ones I want to post onto my desktop. You can control the resolution when you export the photos to the desktop. When I post I go to my desktop to get the photos. If there is an easier way I hope someone posts it.It is no different at all to post images. Just go to the advanced and bring up the upload to post and tell it where you image is ..simple and easy....you just have to know where you image is that is all