Persistive file after reboot


I am running Legato Sandbox application, which creates a file. File is created, it can be read from and written to, but the major issue is that the file is deleted after I cycle power of the board (mangOH Red + SierraWireless WP76xx).

Is there a way to do it so that my created file isn’t deleted trough the adef? But in such a way to give my sandbox application to write and read that file.

same solution than the one from topic Legato writtable directory, can be applied .