Strictly speaking, your "ownership" is only of the hash. Unless you register the film as a copyright, the US won't recognize your ownership of the film. You cannot stop people from sharing or deriving the work without legal protection, the utility the blockchain provides in this instance is entirely cosmetic. NFTs aren't just unnecessary - they're useless without external guarantees. The "chain of provenance" for the cloud is a scam. All digital works can be copied infinitely for $0/copy, and the ultimate irony is that the only way to stop that outcome is from abandoning the blockchain and relying on a government to protect you.
You want to know where all the talented, educated and principled technologists were during the NFT boom? Far, far away from any form of blockchain.