I upgraded to Android 6 and now I want to put some data on my nexus via usb. If I connect the device, I see the Nexus in the Windows explorer, but when I select that, it doesn’t show me the “Internal Storage” Entry.

Does anyone know how to fix that? Also, there aren’t really “USB-Options” anymore, so I can’t select things like mtp there.
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Resolution:

had the same problem, so i enabled developers options, went in the line for usb configuration. it was on “MTP” so i switched in another mode then came again on MTP and it worked. Hope it will work for you

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How to get to developer mode:

Open Settings> About> Software Information> More.
Then tap “Build number” seven times to enable Developer options. …
Go back to Settings menu and now you’ll be able to see “Developer options” there.