Generate OTA file

Hi,

I'm really sorry but I can't figure out how to do this.  I've added FOTA to my ZigBee project (using the light switch example) but I can't find anything on how to generate an *.ota file that I can use to do the update via ZigBee2MQTT.

Am I able to do this on the NRF52840? Is there any documentation on this? I feel like I've been looking for too long and have subject blindness.

Thank you

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