@houstonche, I was having trouble copying the file to the directory also. Here’s what I did. Maybe it will help you…

Make sure that you have the desired png in the Pi directory.

Use startx for GUI support on the Pi.

Go to the Start Menu and choose “Accessories” -> “Root Terminal”

type: sudo cp “name of your image in the Pi folder”.png /etc/splashscreen.png

It should act like nothing has happened and just start a new line. From the GUI, you can go to the etc folder to see if it worked.

Hopefully this helps!