The WireGuard app refuses my file

If the WireGuard app rejects your litora.conf, you almost certainly downloaded a disguised (AmneziaWG) configuration. That file is not broken: its extra parameters are exactly what reshapes the handshake so filters do not recognise a VPN — and the standard WireGuard app deliberately does not understand them.

Two fixes, pick one:

• Install the AmneziaWG app (iPhone, Android, Windows) and import the same file there. This is the one to choose where VPNs are blocked.
• Create a standard configuration instead — sign in, create a new configuration and pick the standard tunnel. Choose this only where nothing is blocking you: the standard handshake is recognisable to filters.