DFU using USB mass storage on nrf52840

My product has nrf52840 with usb mass storage configured using 8MB QSPI flash (same chip as the nrf52840dk - MX25R64)

I would like to allow users to upgrade firmware by dropping files onto the usb mass storage flash disk. 

Is there an example for nrf52840? I can't find it.

I read this conversation which looks relevant, but it relates to the nrf5340 -  DFU using USB file system (not serial emulation)?  

I believe there is an nrf52840 UF2 bootloader from adafruit, I've not tried to use it yet. I would prefer to use the nordic recommended approach.

I found this guide to using external flash for DFU, but it doesn't update using USB mass storage. https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/exercise-3-dfu-with-external-flash/

Any advice is greatly appreciated.

I'm currently NCS 2.6.0, but could update if required.

Kind regards,

-Jason

ps. how do I get a project Id?

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