The page orientation is not in the list with the Q1 features of RadPdfViewer. We have it scheduled and it will
probably be fixed soon after the release.
When it comes to your second questions, as long as you can get a stream to your document, you can load it in the RadPdfViewer. It won't be possible to load the document using its URI, but if you obtain the stream of the document, you can import it in the following way:
All the best,
the Telerik team
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