When I had 16.04, I used the Google Drive integration feature described here on OMG Ubuntu
Since upgrading to 16.10, with Nautilus 3.20.3, that feature seems to have disappeared. It was there on one occasion, but I haven't seen it since, nor have I found an obvious way of getting it back even though I've activated it in Gnome Control Center.
Has the feature been lost with the upgrade?
Install the gvfs-backends package. You can install it with the command
sudo apt install gvfs-backends