I was recenlty in Shanghai and had no problems with OpenVPN, Wireguard or Shadowsocks.

There is no OVPN file for shadowsocks… you need to know the settings of the server and put them in your client. I’m guessing unless you had it working before hand it may be difficult to set up at this point.

If you are using OpenVPN make sure you are using tls-crypt which help with the great firewall. Some people still report having issues. When I was there I found I had to use an IP address to get to my VPN server rather than a dynamic IP forwarding service. Luckily my IP at home does not change very often…