Hello
The MTQN-MNG1-B02 is a cellular modem with Serial UART or USB interface. This is not the SOM model that allows it to host a program.
Model MTQN-MNG1-B01 is the SOM (system on module) build with the additional Cortex cpu that allows you to drag-and-drop a (mbed) program onto the enumerated drive.
Depending on what you are trying to do, you may have the incorrect model modem, but this may help explain the behavior you are experiencing.
-Best Regards