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The PDF viewer displays a "Save" icon but does leaves it up to the developer to implement the Save logic.
In addition to "Send as Email" (which has already been requested) it would be great if a platform specific Save As dialog was presented when the Save button was hit.
Better yet, it would be nice if Syncfusion provided a SaveAs, (and a Share for email) as a stand-alone control with the usual features such as specifying an initial folder, file type, etc...
(I will post that as an separate feature request)