As a result of the below missing operator, some of the glyphs can't be extracted from the CFFFontTable and the characters are not displayed in the PdfViewer:

The end user result is missing letter from the PDF content.

Encoding table headers are preserved when creating subsets.

NullReferenceException is thrown when Find API is used on a newly created document.

Workaround: Export - Import the document before using the Find API

PdfFormatProvider pdfFormatProvider = new PdfFormatProvider();
byte[] exportedDocument = pdfFormatProvider.Export(document);
document = pdfFormatProvider.Import(exportedDocument);

Support for FileAttachment annotations. 

A file attachment annotation contains a reference to a file, which typically is embedded in the PDF file.

RadPdfProcessing currently supports interactive forms whose data is defined directly in the document. To preserve them when importing and exporting documents, add support for import-export interactive forms based on the Adobe XML Forms Architecture (XFA).

From PDF 2.0 the XFA forms are depreciated.

Add support for Arrange Options (level placement):

• Bring to Front
• Send to Back
• Bring Forward
• Send Backward