How to fix "Documents & Sync" High Data usage on iPhone 12/XR/6

iPhone users are reporting issue with iPhone consuming cellular data very fast and when looked down the issue seems to be in System Services --> Documents & Sync. The major data is used by Documents & Settings like 70% to 80%. Excessive Documents & Sync cellular data usage is painful for iPhone users as it is continuously consuming data and people with limited data plan have trouble in managing data.

"Documents & Sync" high data usage

The issue is reported with latest iPhone 12 Pro/ Min/XR/XS and other iPhone version running on iOS 14/14.6 and iOS 15 beta. The data usage by Document and sync keeps on rising like in two days the Documents & Sync usage went from 90 MB to 324 MB. 

How to fix iPhone 12/XR,XS ,8 “Documents & Sync” high cellular usage

Fix 1 : Log out from iCloud account

The other option is to turn off / sign-out of iCloud from the phone and do a hard reset. After the hard reset Log in back to iCloud and issue should be fixed. 

Fix 2 : Turn off cellular data usage for iCloud sync

Go to settings>iCloud>iCloud Drive, and scroll to the bottom, if "Use Cellular Data" enabled then turn it off. 

Fix 3 : Turn on Low data mode

After iOS 13 , iPhone users now have option to use low data mode. You can set this on different data services like 4G, 5G or WIFI. Read this to know about turning low data mode.

Fix 4 : Reset network settings

iPhone might be attempting multiple request in network and causing such high data usage. One easy to way to fix the issue to reset the network setting. Try, Settings > General > Reset > Reset Network Settings. The iPhone will reboot and check the issue again. 

Fix 5 : Disable iPhone keychain 

The iPhone might be synching data with iCloud failing due to various reason. To interrupt the iCloud sync,  Try disabling keychain from iCloud syncing. It immediately reduced my documents and sync usage. Read this to learn more

Source: Shudtech