Undocumented "Use Io Store" packaging setting

What exactly does this option do in the “Project Settings>Packaging” options? It is literally right underneath “Use Pak File” and the tooltip says “all packages will be put into one or more container files”. That doesn’t really give me much to go on. What “container files” does it mean? Is it referring to multiple .pak files? Or is it something else? It seems to be undocumented in the 4.25 patch notes.

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I seen that and I wonder what it is also.

Me too.