How to transfer files to a Nexus 9

[DEL 707]

Not sure what I'm doing wrong, but I can't seem to copy files over to my Nexus 9.

I'm running Windows 10 and my PC see's the device as a Nexus 9, but when I open it, there's nothing inside and when I try to copy a file over, even a zip file under 1mb, I get the message.

"Cannot copy item, the device has either stopped responding or has been disconnected".

Is there some setting I'm missing?

 

[Uhtred]

Make sure you unlock the screen

 

[Fourstar]

May be that your tablet connects by default in charge only or photo transfer mode mode.

Pull down the status bar and you should see the current USB mode. You may have to click it then select "File transfers" from the list.