For that use case, there’s two things you can do:

1. Rent a seedbox
2. Have a local server for downloading torrents, and use a vpn

My torrent client is transmission. It has many ways to do what you ask.

First there’s a web ui which I can access from my pc or mobile. I can input the magnet link there and download.

Transmission also has an RPC client, and because of that many third party clients exist for it. Android apps, CLIs, etc. For all of which, i paste the magnet link and download.

EDIT: I believe Oracle cloud has something against P2P downloads, but I don’t remember what exactly.

I don’t quite understand the use case. Where are you trying to transfer from? PC? Smartphone (what kind?)? From devices you don’t control?

I use rsync to transfer from, PC, Android and other servers. It works well for my use case.