> I have clicked on "Browse..." button for invaders.zip file (37MB) and click > "Continue" and my firefox/edge browsers seem to be uploading something but have > waited a long time (10 minutes or so) still not completing the transfer and no file > was attached and something as below appeared... > > == > We cannot proceed. You cannot edit this post. > > Please use your back button to return to the previous page. > ==
I suspect 37MB is too large. You'll have to upload it somewhere else then link to it.