I'm never seen or heard about this file manager before in till I fond by accident, for a free file app add free with themes and working 100% without problems it can transfer between internal storage to the SD card and vise versa, transferring with WiFi also WOW...FANTASTIC!!! I use ES file explorer pro and I remove from my tablet to use this one that's how good GM Files is! By the way I love the dark theme, I recommend to anyone...thank you very much general mobile official team