How to make Rolling Cache of an area?

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Just to confirm, it looks like this screenshot? Shows a file location? But just grayed out?

https://forums.flightsimulator.com/uploads/default/original/3X/6/5/65545fbb53eef382df94d59f69b07d767cd6474d.jpeg

This is from the [HOW-TO] Create and Manage Manual Cache Regions