Plugin Screenshot

I have a plugin I just published on wordpress repository

https://wordpress.org/plugins/same-height/

I put a .png on the /assets folder in the subversion server. http://plugins.svn.wordpress.org/same-height/

In the readme.txt, I have a comment for that pic.

When I see my screenshots page, I get the comment, but I can only see the alt text as the image doesn’t get found.

What else do I have to do?