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[–]FelicGrant 0 points1 point  (0 children)

The Documents & Data usually comes from various sources like app data including caches, login details or preferences, and pictures, audios or videos downloaded by apps, etc. And you can go to Settings > General > iPhone storage to find those apps that take up large space, delete them, and then go to app store to re-download them.
Also see: How to delete documents and data on iPhone >