File read in STM32

Hi,

We are from Nagra IOT team currently working on IOT products based on STM boards.

We are using SMT32L4 (B-L475E-IOT01A1).

Our current requirement is putting a file in ST board - in flash preferably and read it using simple file I/O operations like read/write.

How can we write a file directly to STM32 flash ?

we know that default start address is 0x8000000 where STM32 work bench writes the application.

STM32 ST-LINK Utility also connects and writes to default 0x8000000. so how and where do we write a file that we can read using another application ?

regards,

Arnab