Jack Wallen/ZDNET Follow ZDNET: Add us as a preferred source on Google. ZDNET key takeaways Material Files is a well-designed Android file manager. This app blows away the competition. Material Files is free and can be installed from the Play Store. I've tried so many Android file managers over the years. I've seen those that look good but lack features, those that have too many features and a pleasing aesthetic, and those that look terrible and don't have enough features.  It's been a tiresome journey, one that eventually had me giving up and sticking with the default. Until now. Also:  7 apps I use to lock down, encrypt, and store my private files - and most are free Recently, I stumbled upon Material Files, which is an open-source Android app , and I almost instantly proclaimed it the perfect Android file manager. It looks native on my Pixel 9 Pro and has exactly the right amount of features.…