Google has been working quietly on an in-house file manager. Development of such an app has not been known to the public, until today, that is. A new app called "Files Go" has accidentally been posted to the Google Play Store long enough for someone to re-upload it to a file-sharing website. As of right now, the direct Play Store link doesn't lead anywhere, only offering a "Not found" page. We installed the app from the mirror link and poked around. There are a few useful features that appear to be aimed at giving you more information and control over what is taking up precious space on...
Source: https://www.gsmarena.com/googles_smart_file_manager_app_accidentally_leaks-news-28120.php