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public void Save()

using (Metadata metadata = new Metadata(Constants.OutputPpt))
{
    // Edit or remove metadata here

    // Saves the document to the underlying source (stream or file)
    metadata.Save();
}

public void Save(Stream document)

using (MemoryStream stream = new MemoryStream())
{
    using (Metadata metadata = new Metadata(Constants.InputPng))
    {
        // Edit or remove metadata here

        metadata.Save(stream);
    }
}

public void Save(string filePath)

using (Metadata metadata = new Metadata(Constants.InputJpeg))
{
    // Edit or remove metadata here

    metadata.Save(Constants.OutputJpeg);
}