Documents & Sync is using my mobile data
I have 2 iPhones, both with the same Apple ID. I find that lots of data (>2gb) of mobile data has been used on both. When I look in Mobile Data, System Services is showing 2.9 gb. When I select that, it shows Documents and Sync having used up 2.7Gb.
I have turned off mobile data for Files and can't see what else could be using the mobile data.
Anyone worked out what is using up this data?
iPhone 8