UE4 for advertisment materials

What kind or royalty or obligation do I owe Epic games if I use Unreal Engine for online promotional materials like interactive in-browser 3d view or UE rendered images/videos?

Will I or the company have to pay royalty for it?

It sounds like there would be no direct revenue for these uses, but could you confirm?

Yes the users aren’t going to sell said content, but they would use it as promotional materials/advertisment for their commercial enterprise.

There wouldn’t be a royalty in that case.