Hi @Bob Jones
Do you get any notifications when connecting the phone to a computer?
If not have you tried another compatible USB cable in case the cable that you’re using is only a charge cable and not also a data cable
If still no good, go to Settings > Developer options > Networking > Select USB configuration > MTM protocol If the phone does not display Developer options, press build number seven (7) times in the about phone tab
Not quite sure if this is fully applicable to your particular model as the user manual doesn’t show the options in Developer Options (go to p.51/56 in manual - there is no page numbering in the manual, this is the .pdf numbering)