Do I have to pay something if I create a commercial for the company I work for

I think in my spare time to make some short commercials for the company I work for. Maybe we’ll post it on the official YouTube. Just to help the company. The company is not IT, and no one asked me to. But I am afraid that since the company is a commercial company, Epic Games may have questions or claims to the company.

Do I have the right to create a video for the company for free? Will Epic Games have any complaints about advertising created for free on their engine by an enthusiast? Will I be obliged to pay for such actions?