Files Go Beta
Files Go Beta is a NEW beta app from Google which was released recently. I would suggest joining the beta here b/c google beta programs could be limited by a number of beta testers who can participate.
What is this app about? First of all, it is a GO app. As it was announced on the Google I/O 17, those apps are optimised for the low-end devices. Secondly, this app solves one of the most painful problems for such devices - storage cleaning.