You can download Google Drive or DropBox and move apps and files between your computer and the Nexus 7. Additionally, you can attach the USB cable and transfer them. But in order to do that you'll need to download an app for your computer called Android File Transfer if you have a Mac. If you are running Windows then make sure you have the latest USB drivers downloaded on your computer. Once you've connected the tablet make sure you've checked media device and not camera in the pull down menu on the N7.