Your SNO site is built on the WordPress.org content management system, which is highly customizeable and interactive. One of the main ways to interact with your audience is through multimedia, including video, audio, infographics, polls, and social media.
Each of the those media are most often added to websites using what are called Embed Codes. An embed code is a block of HTML which is embedded in the page-source and creates the media object on your site in doing so. It needs to be obtained from a site already hosting the media (e.g. Youtube, Vimeo, infogr.am, Spotify, Twitter, etc.), because the embed code points back to that site.
Basically, this means you can do just about anything with your SNO site by creating something interactive elsewhere and embedding that content directly on your site without having to upload it and take up space.
A classic example of this is adding a video. The common practice is to upload your video to a service like Youtube or Vimeo. Once done, the service then gives you the option to share your media. Included in those sharing options is the option to Embed. Copy the long embed code provided and go back to your SNO site to paste it somewhere like in a story or a widget.
This isn't limited to videos, though. You can embed almost anything, including Tweets, audio clips, podcasts, images, timelines, graphics and infographics, you name it. In short, if it has an embed code you can use it in your SNO site!