Hi,
I use Notepad from the command prompt... I've never had a problem with copy\paste when using it... Just the mouse\keyboard issues mentioned, and those only happen with my Tablet...
The Ctrl+V method may not be working simply because you can not click on the drive with the mouse or other device to select it properly...
I don't think a USB 3.0 Hub would be a problem... I have used both 2.0 and 3.0 hubs for this purpose, and both worked the same... My Tablet only has a single USB 2.0 port...
There is a bootable 3rd party Utility program called Parted Magic that has a "File Explorer" function that would allow copying the needed files if necessary... My memory is that it shows all hidden files without any special steps as it is Linux based and does not recognize restrictions imposed by Windows...