User Data
User data refers to files that are visible to the user and likely to be managed outside of your app. For example, a painting app would likely enable the user to save a creation as a regular image file. (Before the user saves it, however, it is likely to be stored as an app file so the work-in-progress doesn’t get lost.) User files could be on the local device, a network share, on OneDrive, or hosted by an arbitrary Web service. User files do not get deleted when an app is uninstalled.
An app cannot create/change/delete user files without permission from the user. Fortunately, such permission does not come in the form of an annoying “Do you trust this app to open this file?” prompt, but it is an implicit part of normal user actions. ...
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