How to upload the application hex file uisng USB Drag n Drop on nrf52840

Hi Everyone

I am trying to achieve the following objective

I want to upload the hex file of my application code which blinks leds after 1 second without using th SWD interface ,instead to program the nrf52840 ,i want to use USB Drag  n Drop method(Just like what we do to upload bootloader)

Do i need to upload another bootloader to achieve this functionality?

I am using SDK15.0 with nrf52840 PDK.

What is the purpose of nrfUSB port on the PDK (besides the IFRESET/BOOT button)?

Thanks 

Rajat!

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