This tutorial will get you started with using the Module's flash file system for storing your own files.

Module families with FFS access available

List contents of and free space on FFS, along with file/directory stats
Create a new Directory on FFS
Remove an existing Directory from FFS

Open / Create a new File on FFS
Close an open File on FFS
Rename an existing closed File / Directory on FFS
Remove an existing File from FFS

Writing to an existing File on FFS (Sequential and Random Access)
Reading from an existing File on FFS (Sequential and Random Access)

See related articles:

https://iot-developer.thalesgroup.com/tutorial/flash-file-system-access-...

https://iot-developer.thalesgroup.com/showcase/command-mqtt-client
https://iot-developer.thalesgroup.com/tutorial/data-transfer-methods-mqt...
 

Builds on the original work by Antonio Lopez:
https://iot-developer.thalesgroup.com/tutorial/zoc-script-bgs2ehsxpdsxpxx8-ffs-accessreadcreate-files