RAK7258 with AWS IoT Core FUOTA

We are working with RAK7258 running the latest WisGateOS V1.3.6.

We are trying to connect this to AWS IoT core. However there are options to configure either CUPS details or LNS details. But not both.

We want to use the gateway to try AWS FUOTA function and my understanding is that we need both CUPS and LNS for multicast and FUOTA operations.

How can we go about doing this?

Has anyone used the RAK7258 and performed FUOTA via AWS IoT Core?