Converting .HEIC to JPG using imagick in C#

I am using MagicImage to convert heic to jpg, but for some reason it does not work. My UpdateClientFile method saving pictures that were sent here. So I need help to figure out what I am doing wrong. So I already implemented MagicImage code in my method.

private void UpdateClientFile(ClientFileType type, FileData newFile, int clientId, string fileName)
{


    using (MagickImage image = new MagickImage(fileName))
    {
        string newFile12 = fileName.Replace(Path.GetExtension(fileName), ".jpg");
        image.Write(newFile12);
    }
    Console.WriteLine("Processed file '{0}'.", fileName);

    var currentFiles = 
        _clientFileService.Value.GetFilesByClient(clientId).Where(x => x.ClientFileType == type).Select(x => x.Id).ToList();

    _clientFileService.Value.MultipleDelete(currentFiles, null);

    _clientFileService
        .Value
        .AddFile(
        new ClientFile
        {
            ClientId = clientId,
            ClientFileType = type,
            ContentType = newFile.ContentType,
            Data = newFile.Data,
            FileName = fileName,
            DateChanged = DateTime.Now,
            Guid = Guid.NewGuid()
        });

}