In this example, I'm going to copy an AutopilotConfigurationFile.json in my OSDCloud Workspace in the Media\OSDCloud\Automate directory. Additionally, I'll copy a WIM to Media\OSDCloud\OS so that don't have to download an OS for my testing.
Boot to WinPE
Now I'll boot to a Virtual Machine to this ISO and start an OSDCloud deployment. The screenshot below should help you visualize where the Autopilot file is on the ISO
You will see the AutopilotConfigurationFile.json is identified before the disk is wiped. This is for you to validate that your process worked.
At the end of the OSDCloud deployment, the OSDCloud Automate will inject the Autopilot Configuration File automatically