Nexus 5 with Android 6, can access phone contents on Win 7 pc

Hi,

I recently installed the OTA Android 6 update.

All seems fine, except today I wanted to copy some of my photos off the
phone and put them onto my PC. But when I connect the phone to the pc
all it shows is the icon of the Nexus 5 but does not show any folders!

Does anyone know if there is a hidden setting somewhere that I have to
enable or is there something else I need to do?

BTW, I have my phone unlocked (not rooted) when I connected the phone so it is unlocked
while connected to the PC via the USB cable.

Any help would be appreciated.