I didn't want to buy a m.2 usb case so I cloned the existing m.2 from inside the PC to some USB HDD.
I popped in the new big m.2 drive, booted my Apricorn clone CD and cloned from the external USB HDD on the Apricorn USB adapter to the internal drive.
Worked. But you will find no one will document this as in a step by step. Some folk will be lost how to do this as they want to avoid the "extra" clone kit and external drive.
Has anyone successfully upgraded the M.2 card on this machine with an M.2 Card larger that 128GB. HP gives very little assistance and provides conflicting answers.