title: USB connection to Android does NOT offer an MTP choice
body: <p>When I plug USB cable from Win-10 laptop to my HTC Nexus-9 tablet, and then tap on the resulting notification in the Android notification list, the resulting popup choice no longer offers me a choice for "MTP".  (The Android version is Nougat, aka 7.1.1)</p>
  
  <p>(In the past, it WAS offering me an MTP choice, but now it offers only a std 'file-transfer' option, and a PTP photo transfer option, but NOT the MTP choice.)</p>
  
  <p>What I'm trying to achieve is for it to assign a drive-letter on the Win-10 side, so that I can manage the MP3 audio files (via the Windows-cmd-shell) that I've uploaded to the tablet.</p>
  
  <p>Anyone know how to get Android to once again offer me the MTP protocol option?</p>