NoSus: would one-time sharing or control after sending be more useful to you?

I'm Shubham, the maker of NoSus. I'd appreciate help choosing the clearest starting workflow for people who share files.

The product includes one-time Burn notes/files and document links with watermarks, access logs, and revocation. There's also a phone-approved workflow for selected files on a borrowed computer.

You can try the Burn tool at https://nosus.foo without creating an account. Use a dummy note, open its link in another browser, and try reopening it. I'd love to know which step feels unclear or unnecessary.

For product validation: when did you last need a file to be opened just once, or need to stop future access after sending a document? What did you actually use? What would make another tool worth the extra step?

I'm the developer and am looking for criticism, especially reasons this wouldn't fit your workflow. Screenshots and downloaded copies can't be recalled; watermark emails are self-reported. Burn redemption codes temporarily retain keys on the server, and SecureSend is not end-to-end encrypted.

Which single problem would you lead with, and what would you need to see before trusting a product like this?