The data received in the NFC callback event is already saved to nRF52832 flash already or not?

[WFKwok]

I am working on a nRF52832 NFC tag application.
If I use a NFC-enabled smartphone to write a text message to the NFC tag emulated by nRF52832.
The nfc_callback callback function for handling NFC events will be called.

What I would like to know that the "uint8_t *data" NFC recceived/written data from smartphone is already stored to nRF52832 internal flash automatically?
Or the data is just stored to RAM only?

If the NFC data is stored to flash already, what is the default memory location?

Or if the NFC data is just stored to RAM, that means I need to perform FDS store action by myself, right?

Thanks.