Face ID replaces Apple's fingerprint tech (Touch ID) to unlock your iPhone and approve certain actions. It takes a little getting used to and you will find yourself going for the non-existent Touch ID button at first.
Cloud storage services sync folders on your computer to the cloud; allowing you to work from a folder across devices. If you accidentally delete a file sometimes these services even have a recovery feature. This of course only works for files that are in the synced folders.
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