Don’t see why this wouldn’t be possible. I personally probably would just upload and download from an object storage (like Linode or Digital Ocean). That way uploads and downloads should be faster (since they can probably scale easier). And usually the bandwidth and storage cost is lower than if you store it directly on a server.
You can then use Phoenix to generate the time-limited token to upload directly to the object storage and if only certain users / only logged in users you can generate a token to download the file too. If it’s less sensitive you can put a CDN infront of it like Cloudflare to make it even faster/cheaper (technically you can’t use cloudflare only for files like that but unless you are doing many TB per day they probably won’t care).
