Ask HN: Best secure self-hosted solution to host download links?

I'm starting a service that involves me generating large files (model weights) and delivering them periodically to clients.

Payment is done via gumroad (also open to gumroad ecom flows) and I run some basic scripts that eventually result in a large 200GB file or so to deliver. I don't want to pay for bandwidth in aws s3 and I have G fiber so I'd rather just host it myself.

Curious if anyone has used existing open source tools for this? I basically need to be able to generate custom download links that will expire in a few days time that are a bit more secure than just SFTP or an open directory.

Cheers!