I downloaded a series of books to my tablet in a zip file. I see here that ES File Explorer is really popular although it's not easy to find...listed way down the list on the Play store. So it says this is compatible with all your devices (which seems to be rare these days). I clicked Install and it brings up the list of devices to install to. So I pick this one. It says it will be downloaded shortly. Now the Install button turned to Installed - but it's nowhere to be found on the tablet. I did this with Winzip too. What's the deal?