I am interested in one question.
I need to know where the information about the partnership
I have created a game with the unreal engine, I want to load on steam, I need to know the details of the contract about it. Seems to go a certain amount of interest in this company from sales! Would like to know the exact information what and how!
Read the FAQ: https://www.unrealengine.com/faq
As stated in the FAQs, you will need to contact Epic Games as soon as you have planned to release your game in order to provide them the information they need.