My iPhone won't sync to my mac
How do I sync my iphone to my MacBook pro
iPhone 11
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Here is informations to sync your iPhone to your Mac.
https://support.apple.com/en-us/HT210612
If you are referencing iCloud then see here how to use iCloud on all your devices.
https://support.apple.com/guide/icloud/set-up-icloud-mmfc0f1e2a/icloud