Currently, this have to be achieved with custom logic.
The saveUrl of the component can be bound to the state and when the user chooses the directory this will set the correct URL for the Upload.
Please have in mind that we do not have a UI component for choosing a directory. If you have seen such a component, please share a link, and we can open a feature request for it as well.
Let me know if you need additional information on this matter.
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