Yeeesss, that you may post it right here.
Also you cannot add anything to the directory, the uploaders of the website are responsible to upload any new works of art or animations. If you’re talking about how to add your work in the animation post, you can post a dropbox link for the animation. If you dont have a dropbox, then you can get one by going to this post right here!
As for the magic animations that you mention, it shouldnt be an issue because mainly Apocalypse, Aureola and Forblaze were made by the Intelligent Systems so all that work goes to them. You can credit the person who ripped them out for us to use.