Welcome aboard. 0 kB/s upload usually means your torrent client can't accept incoming connections, so other peers can't reach you to pull data from you. Two things fix it most of the time: make sure your client's listening port is open/forwarded in your router (or turn on UPnP / NAT-PMP in the client settings), and if you're on a VPN, use one that supports port forwarding. Also double-check the client is actually seeding the completed files. Once peers can connect to you, your upload will pick up. Let us know if it's still stuck after that.