I am trying to connect to a server with FluentFTP.GnuTLS.
Connection immediately works with FileZilla and it says the server speaks:
Protocol: TLS1.3, Key exchange: ECDHE-SECP256R1-RSA-PSS-RSAE-SHA384, Cipher: AES-256-GCM, MAC: AEAD, ALPN: ftp.

How do I configure for this?, I Got:

public bool Upload(string fileID, bool ignoreCert)
{
    var client = new FtpClient(host, user, pass);
    client.Config.CustomStream = typeof(GnuTlsStream);
    client.Config.CustomStreamConfig = new GnuConfig()
    {
        SecuritySuite = GnuSuite.Normal,
        SecurityOptions = new List<GnuOption> {
            new GnuOption(GnuOperator.Exclude, GnuCommand.Protocol_All),
            new GnuOption(GnuOperator.Include, GnuCommand.Protocol_Tls13),
            new GnuOption(GnuOperator.Include, GnuCommand.KeyExchange_Ecdhe_Rsa),
            new GnuOption(GnuOperator.Include, GnuCommand.Cipher_Aes_256_Gcm),
        },
        SecurityProfile = GnuProfile.None,
    };           

    client.Config.EncryptionMode = FtpEncryptionMode.Explicit;
    client.Config.DataConnectionType = FtpDataConnectionType.PASV;
    client.Config.LogToConsole = true;
    client.Config.DisconnectWithQuit = true;

    try
    {
        client.Connect();
        if (client.IsConnected)
        {
            Console.WriteLine("connected to FTP");
        }

        client.UploadFile(fileID + ".ics", fileID + ".ics", FtpRemoteExists.Overwrite, false, FtpVerify.Retry);

        if (client.FileExists(fileID + ".ics"))
        {
            return true;
        }
        else
        {
            return false;
        }

    }
    catch (Exception e)
    {
        Console.WriteLine("error");
        File.AppendAllText("logfile.txt", DateTime.Now.ToString() + " Upload error upload: " + e.ToString() + "n");
        return false;
    }
    finally
    {
        client.Disconnect();
        client.Dispose();
    }
}

I got the error:

Status: GnuTLS: 0 Debug : 5 Internal: REC[0x555937dd32d0]: Alert[2|120] - Es konnte kein unterstütztes Anwendungsprotokoll ausgehandelt werden - was received

which translates to: could not find any supported protocol.
this was also the case with all options set to auto.
could it be that there is a unsupported combination of protocols used by this server?