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  • try this: In Preferences turn on verbose output for Upload. while the board tries to Upload and can't find the right port, reset the board. perhaps it changes the port back to the one set in Tools menu and upload starts Commented Nov 10, 2018 at 13:20
  • That was very interesting. I did as you said, it failed, but then a message with the Arduino infinity/dipole symbol turned up at the bottom of the screen, saying "download to use ...". I did so, let it run, and it then ran, finding the new comms port Commented Nov 10, 2018 at 15:33