I had this same problem, and after trying a lot of things, I tried a different cable, and it did the trick. It may be that the cable that comes with the camera is not Apple-certified, so the computer doesn't recognize it. I've had this happen with other devices.
USB charging with X-T3 firmware v4.00
in Fuji X-T3 / Fuji X-T30
Posted
I had this same problem, and after trying a lot of things, I tried a different cable, and it did the trick. It may be that the cable that comes with the camera is not Apple-certified, so the computer doesn't recognize it. I've had this happen with other devices.