Marshmallow USB connection type I just flashed the Android 6 Image to my Nexus 7 (2013) LTE a few minutes ago. It was a clean flash, so I copied my files over to my PC. 
When I plugged it in after it booted, Windows detects it, installs the drivers automatically and shows the device in My Computer. From it's icon, It's in MTP mode. But when I open it, I can't see the usual "Internet Storage" disk that lets me access my files. The device shows a blank folder. 
I searched the Settings app for "MTP" &amp; "PTP" but found nothing. (Unlike in Lollipop) In the "Storage &amp; USB" section also, there is no mention of a USB connection other than in the title. 
I can't swipe down the notification area while the device is plugged in because the screen is broken (I use a mouse) 

What might be my problem? 
PS: The device has an unlocked bootloader so I can edit system files.

Thanks.
You can swipe down the Notificationbar and it will show Charging only. If you click that entry you can select the desired mode. The selected mode won't be set as default, so if you plug your device again, it will be on Charging only again.

To set the default mode you first need to enable developer mode (don't ask me why...). This can be done by going to About phone settings and clicking on the build number a few times.

Then go to the now accessible Developer Settings -> USB-Configuration (should be under the Network section). This should be set to the desired mode. In my case it was allready set to MTP (the desired mode), so i had to set it to another mode (for example Charge only) and then set it back to MTP.
Hope this helps!

EDIT: This only seems to work once. So if you disconnect and reconnect the device 2 or more time, the default is again on "Charge only". It is mentioned in the changelog of Android 6. Link-https://developer.android.com/about/versions/marshmallow/android-6.0-changes.html#behavior-usb