Win32Exception is thrown during a long-running process importing many documents with images.

Add support for annotations with custom Subtype.

Support for FileAttachment annotations. 

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

Missing spaces from TextFragments when exporting to plain text.

Usually, the object references are expected to be stored in the following format: "5 0 obj". However, if the format is "0000005 0 obj", the document can't be parsed successfully. As a result the document is not displayed in RadPdfViewer.

Currently we skip these images in the import for PdfProcessing.

StackOverflowException is thrown when applying filter for SVG.

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.

"An error exists on this page. Acrobat may not display the page correctly." error in Adobe when inspecting a page with DeviceGray ColorSpace image after import-export.

When importing a document, the following error message is observed when reading the Arial, Italic font: System.InvalidCastException: 'Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfLiteralString' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfName'.'

Add support for Arrange Options (level placement):

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

When a PDF document is being imported, some of the characters may experience unexpected results while reading the font.

NOTE: the document is displayed in the MAUI/WPF/WinForms PdfViewer controls with missing parts of the text.

Wrong font loading when FontFile2 is CFF (Compact Font Format).

The PDF/A-1 standard uses the PDF Reference 1.4 and specifies two levels of compliance:

- PDF/A-1b - Its goal is to ensure reliable reproduction of the visual appearance of the document.

- PDF/A-1a - Its objective is to ensure that documents content can be searched and re-purposed. This compliance level has some additional requirements:

• Document structure must be included.
• Tagged PDF.
• Unicode character maps
• Language specification.

Since the PdfProcessing and its PdfFormatProvider is compliant with the PDF Reference 1.7. , the produced documents are created with this version as well: 

Handle the import of documents with null elements in the Associated Files (/AF) collection.

PdfProcessing: ArgumentException is thrown when importing a document with a duplicated filed names.

Add support for "AcroSendMail:SendMail" named action.

From R1 2017 all annotations (including sound and video) are supported for import-export scenarios by using PdfStreamWriter class. 

These feedback item will be opened as we may add API for generating and inserting new sound annotations from scratch in the file.

When a source RadFixedDocument is merged to a target RadFixedDocument, the content of the source document is cleared.

WinAnsiEncoding it is imported as StandardEncoding since WinAnsiEncoding is still not implemented in RadPdfProcessing.