It looks like a polar bear in a snowstorm. Or maybe it's something like this: One way to reliably post an image is save it into a local file, and then upload the file into EliteTrader.
1. check that the file is not some odd unsupported image type (Apple got an image type exclusive to iPhone and OSX). gif, jpeg, png should be supported. 2. check that the file got an valid image file extension like .png .gif .jpg otherwise server may not be able to identify the file as being an image.