I did say it is required, but on the list, aka IMM5556, does not mention AOR in anyway, nor the upload list when you submit online.
If you provide sufficient information to prove that you are "first stage approved" in APR, you are ok. Countless people submit online without go out their way to provide something not on the list, and they got approved regardless. As long as you are eligible for BOWP, the officer will not blindly ignore and refuse application, certainly will not mark it as "incomplete" for all that matters.