transfering media

my question is why in gods earth can you not transfer files to usb drive plugged in to i can see the files but just cant wright to it my question is and quote me its a media box so before someone its its becuase of andriod i have anther media box a laser brand and yes i can transfer files to it all day long with out pluging usb drive out and hooking to comptuer this other lasermedia-player
so my question is why not as one would have thought it would have been comon sence for that feature...

transfering media