Adding the Sintel Media Library app to your site is pretty easy.
To add it perform the following steps:
- Open Site Contents.
- Click on "add an app".
If you are using the new "Modern Experience" in SharePoint it looks a little different as shown.
- Search for "Sintel Media Library" and if it's not found you can choose to get it from the "SharePoint Store".
- Click Trust It when asked to complete the deployment.
- The installation will proceed and once it's completed you will see the Sintel Media Library App appear in the site.