How to sync your iPhone and iPad with messages, calls, clipboard and more
Open the Settings app on your iPhone and tap on your name at the top of the app.
Now tap on iCloud and enable the data you want to sync to your iPad.
Open the Settings app on your iPad and follow the same steps to make sure the selection is identical.
Now open the ‘Passwords and accounts’ from the main settings page. Make sure the same email accounts are present on both your devices.
If the 5GB free storage option is not enough for you, you can buy more storage by going to iCloud in the settings app and selecting the ‘change storage plan’ option. From here, you can buy a plan according to your requirements.