I am writing this guide becuase I coudn't find a proper one online which contained all the information I was searching for. I will try to guide you through the process of enabling link aggregation (802.3ad) with your Ubiquiti hardware and your Unraid server. Note: not all of Ubiquiti's hardware supports link aggregation (LAG). As of the time of writing Ubiquiti states the following.
Applicable to all UniFi Switch models excluding the USW-Flex and USW-Flex-Mini.
Source: Ubiquiti