The Partner Media Library (accessible from the Partner Account tab) provides storage for images used in partner branding such as those used for email and the login page. The Media Library makes use of Azure's CDN network to deliver images as needed with appropriate CORS settings. This makes Media Library content usable in most browsers especially those that enforce CORS headers.
Since these links can be used across all companies, the media library can also be used to host images and documents for the Partner Content library.
Please note that all content posted in the Media Library is public and is accessible to anyone without requiring a password. Confidential information should never be posted in the Media Library.