USB Mass Storage Sample Application

Hello. I'm newbie with the NCS environment so tell me if I'm saying nosense. I use the nrf connect extension in vs code ide. (SDK: v2.7.0 toolchain: v2.7.0)

I want to create usb mass storage with spi flash on my own card so I wanted to examine the mass storage example. I copied the sample usb mass storage example with create a new application. I want to build the FAT FS Example as FLASH-based. I read README.rst but I don't understand how to do it. Can you help me with this?

Thank you.

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