It’s really fine if you don’t get paid for this project. Just as you said, I get that you need experience to build your portfolio and reputation as a video editor. The credits would’ve been fine but it seems even that you’re not getting it.
Have you tried taking the path as a freelancer? I think it would be a better option. You’ll have to interact with different clients and artists (either big or small project) and build your portfolio and experience, rather than enduring this painful project.
