Accessing external files on iPadOS

The upcoming iPadOS 13.0 will allow users to connect external USB devices to iPads for the first time. Has anyone figured out how to access those files programmatically (thru Swift)?

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Check the wwdc presentation on this subject at https://developer.apple.com/videos/play/wwdc2019/719/

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Check the wwdc presentation on this subject at https://developer.apple.com/videos/play/wwdc2019/719/

Thanks, this was exactly what I needed!

Is this possible on iPhone/IOS?