To copy a file or folder perform the following steps:
Open a Nautilus
window. Choose File -> New Window
to open a second Nautilus
window.
In one window, select the folder from which you want to copy the file or folder. In the other window, select the folder to which you want to copy the file or folder.
Grab the file or folder, then press-and-hold Ctrl. Drag the file or folder to the new location in the other window.
To copy the file or folder to a folder that is one level below the current location, do not open a new window. Instead, grab the file or folder, then press-and-hold Ctrl. Drag the file or folder to the new location in the same window.