I updated my Nexus 7 to Android 6.0.1. Then I plugged it into my Win 7 computer via USB as I've done many times before. In Windows Exploring, I can see the Nexus 7 but can't see any contents, nor can I copy a file to it. When I try to copy a file to it, I get "Cannot copy item - The device has either stopped responding or has been disconnected."

I tried to upload photos with a new post and got this message: The upload folder is full. Please try a smaller file and/or contact an administrator.

I got that message even trying only one photo (jpg file), size 60KB.

When I first set up my 2013 Nexus 7 yesterday, it required me to enter a gmail address which I did. However, I use that address for receiving listserv mail, which is read and answered with my browser on a computer, and I see no point in all that mail coming into the Nexus.

- I plan to get a Nexus-only gmail account. How do I set the Nexus to that email address instead of the current one?

- Related question: Can I also use the Nexus to receive and send email from POP email accounts? I assume I can but haven't looked into it.

I clicked on Photos and it displayed a screen saying the following (abbreviated):
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Automatically back up your photos

They'll be enhanced

And combined with Auto Awesome moments
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How do I turn off that stuff?

I just got a 2013 Nexus 7 and am trying to figure out how it works. Lots of questions to ask :-)