Tim said: 
> I found this a while ago
>
> https://tomsalmon.eu/2020/01/mounting-android-phone-over-usb-on-debian/
>
> Not sure how relevant it is now a days
Thanks Tim. That didn't work, but the CLI did provide a possibly more 
informative error message:
error returned by libusb_claim_interface() = -6LIBMTP PANIC: Unable to 
initialize device
terminate called after throwing an instance of 'MtpErrorCantOpenDevice'
  what():  Can't open device
The phone itself has instructions for file transfer with Windows and Mac
computers, but not Linux. As Android is based on Linux, that seems a 
little odd to me.
I have found a way to contact the manufacturer, Motorola. Maybe they can
solve the problem.
Peter Alefounder.
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