Instructions apply to iPhones and iPads running iOS 11 and later.
Repeat this process with the second machine.
The prefs must be set identically on both devices for the sync to work.

Go toSettings>Passwords & Accountsand ensure the email accounts are set up the same on both devices.
After you set up iCloud on both devices, they’ll remain synced.
This approach keeps the majority of your information identical across both devices.

The amount of iCloud storage used is displayed at the top of the iCloud options screen.
Go to the iCloud prefs screen and tapManage Storage>Change Storage Plan.
Can You Sync iPhone Directly to iPad?

To transfer automatically, select theiPhoneicon >Music>Sync Music.
To transfer manually, selectSummary>Manually manage music and videos.

