Arc Browser is amazing, the only thing it lacks is the ability to choose an external storage such as usb or hard drive to store data images, apparently the developer states it is a limitation from android as it only shows internal storage and sd cards. I've been trying to use it on a Amazon Fire Stick with retroarch and a usb otg as external storage and it doesn't detect the usb unit to store the data directory but it allows me to choose the roms from the usb otg.