Files: Add Multiple Files to Libraries, Share Files via Public Link, and Customize Files Detail Page

Libraries are available in Lightning Experience, even for users without Salesforce CRM Content licenses. Multiple upgrades to libraries help you work better in Lightning Experience: add multiple files to a library, customize your file detail pages, and take action on files right from your Chatter feed.
Files and Files Connect for cloud-based external data sources are available in: Professional, Enterprise, Performance, Unlimited, and Developer Editions