Unable to overwrite file using WinSCP dll with WebDAV

SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Webdav,
    HostName = "www.domain.se",
    UserName = "User",
    Password = "Password",
    WebdavSecure = true,
    TlsHostCertificateFingerprint = "00:00:00:00:00:00:00:00:00:00:00",
 
};
using (Session session = new Session())
{
    // Connect
    session.Open(sessionOptions);
 
    // Upload files
    TransferOptions transferOptions = new TransferOptions();
    transferOptions.TransferMode = TransferMode.Binary;
    transferOptions.OverwriteMode = OverwriteMode.Overwrite;
 
    TransferOperationResult transferResult;
    transferResult =
        session.PutFiles(@"C:\temp\test.json", "/webdav/files/test/", false, transferOptions);
    // Throw on any error
    transferResult.Check();
 
    // Print results
    foreach (TransferEventArgs transfer in transferResult.Transfers)
    {
        MessageBox.Show("Upload of " + transfer.FileName + " succeded");
    }
}