I was trying post the super-spectral primaries 2560x1440 screenshots from my game but I cannot even seem to post one without getting this error!
That error message tends to mean that you pasted some very large file or piece of text directly into the description of your page. If you need to add an image please use the image upload tool. Do not paste the image into the description field editor as it will try to convert into a text format and then take up too much size to be saved.