The set of new features that have just been added to Google Files Go includes — but is not limited to — the following: advanced file browsing, secure app installs, faster sharing, and even a built-in media player that supports both audio and video files, as well as background audio playback.
https://www.notebookcheck.net/Google-s-Files-Go-app-gets-faster-sharing-and-a-built-in-media-player.346241.0.html