Michael has tried to move files onto his Google Nexus 7, but halfway through, the Nexus 7 freezes up. Leo says the card could be full. Copying a file larger than 2GB won't work, so keep it under that. File copying in Windows 7 and older was terrible and unreliable. So, it's not surprising that copying large files is problematic in Windows. Using the command line function "robocopy," (or "Robust File Copy") works better. Other choices include AirDroid or DropBox.