File Storage Abstraction allows a seamles experience for working with files across different platforms and locations.
Essentials has several features that involve reading and/or writing data with abstraction, allowing for interaction with many different types of filesystems regardless of their location. To accomplish this, we have implemented FlySystem as the abstraction library of choice which provides a unified interface for working with various filesystems.
You can find a full list and details of supported filesystems in the storages reference section.
Notice that at the moment storage abstraction is only used by Layouts Addon, although it it possible to use it in custom addons as required.