i got the nokia 6 a week back. when i checked internal memory shared information, system is using 9.8gb. android version 7.1.1, please confirm whether its an android issue.
I have similar size. I think it's normal. Hopefully, Nokia 6 as a 32Gb internal memory size. I bought a 64Gb µSD (as I planned regardless of the internal memory size). So I can easily transfer or save files (like videos) via an application ;)