I have just informed Nokia's Chat with us about this:
When I first bought the handphone it was possible to share data e.g. photos between handphone and my Ubuntu 18.04 computer and vice versa. But after the handphone was updated to ver.12, it was not possible. However, things became possible after I rebooted the computer so the culprit in this case was the computer. So if such things do happen to you even if you are using a Windows computer, take my advice, reboot the computer!
Time to reformat the computer!