How app can access files on USB OTG storages in Android 6.0 (API level 23) without root?

Since Android 6, according to the USB Media Support documentation, the Storage Access Framework seems to be the only available mecanism:

In Android 6.0, any device that is not adopted is considered portable. […] Third-party apps must go through the Storage Access Framework to interact with files on portable storage; direct access is explicitly blocked for privacy and security reasons.

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