i have 20gb of others space on my phone. I talked with Apple support several times. Escalated, sent data engineers etc. I have the e-mails. Apple said they do not have to solve software problems in your device because under their warranty conditions they do not guarantee uninterrupted service. therefore you do not have any right to do anything about others space which composed of number of undisclosed things you don’t know or change. basically like battery scandal, they now come up with storage solution to push people to change their phones.