Do not submit something that is merely a sound visualizer set to music, or a recording of your music project timeline. If you want to promote your song in the movie portal, it should be set to original animation like a proper music video; otherwise stick to the Audio Portal.
All submission rules can be found here. https://www.newgrounds.com/wiki/help-information/terms-of-use/game-and-movie-guidelines?path=/wiki/help-information/terms-of-use/game-and-movie-guidelines
Cheers
gamejunkie
NG Movie/Game Portal Moderation Team