I'm not part 107 but I am registered as a recreational pilot. I've been invited by the manager of a California State Park to shoot drone video to help promote diversity and awareness of the State Park on their website. They are handling all the necessary authorizations and I don't know what that entails (yet). My question is if I'm volunteering my services and do not get paid, whether I'd legally need a Part 107 to film this? Thanks in advance if anyone knows!