This property determines whether the Save method appends to (rather
than overwrites) existing image files.
If this property is set to true and a file already exists then
the Save method appends the rendered image to the exisiing file
rather than just overwriting it. In this way you can build up multi-page
images.
For in-memory operations you can use this property set to true in conjunction with a MemoryStream and the Save overload that supports streams.
This property is used for TIFF output only.
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