I am trying to follow the published instructions, without success.
I am able to create a Single Player Scenario game, but when it is uploaded to GMR, all of the other players are set to AI, with no apparent way to change them to Human Players.

Additionally, these instructions are confusing to me:

Originally posted by GMR:

From here, the mod setup can vary depending on the mod. Most of the time, you'll select Single Player Game and then Set Up Game. Sometimes, especially for scenarios or custom maps, you may need to select Custom Game or use special settings in your game setup.

I can't find an option for "Custom Game" anywhere in the Single Player setup process.

Any assistance would be greatly appreciated.