The values in the forms are not displayed in the document visualized from the viewer. 

For some TrueType fonts, the spaces are displayed as rectangles.

Some Image XObjects are imported but not displayed in PdfViewer.

Some Image XObjects are imported but not displayed in PdfViewer.  This behavior usually occurs when the document contains scanned images.

Paths in the documents are not visualized in the PdfViewer. 

Most PDF Viewers come with the ability to print, email, text etc the PDF that is loaded.  For example, in the default iOS PDF viewer there is a "share" icon.  When the "share" icon is tapped, multiple options and apps come up that allow users to "print", "message/text", "email" the PDF.  It would be a great feature to have in the Xamarin UI PDF Viewer.  It could just be part of the PDFViewer Toolbar options.

System.ArgumentException: Unsupported touch action type.
Parameter name: actionType
   at Telerik.XamarinForms.SkiaSharp.Interaction.SkiaViewInteractionAdapter.Convert(SKTouchAction actionType)
   at Telerik.XamarinForms.SkiaSharp.Interaction.SkiaViewInteractionAdapter.OnTouch(SKTouchEventArgs e)
   at Telerik.XamarinForms.SkiaSharp.Interaction.SkiaViewInteractionAdapter.GlView_Touch(Object sender, SKTouchEventArgs e)
   at SkiaSharp.Views.Forms.SKGLView.OnTouch(SKTouchEventArgs e)

is thrown when scrolling the document using the mouse wheel and using latest official SkiaSharp Views Forms version 2.80.3

The pdf content is not visualized properly on UWP and iOS when the file is loaded from a stream. 

Also if you try to load PDF twice on the same PDF Viewer, an exception is raised.

Currently, importing a document with non-embedded TrueType font will result in a font instance with an empty font source. Support should be added for providing custom font data of TrueType fonts during document import.

Pdf document is not loaded when it contains Type1Font "middot" glyph.

Exception is thrown when importing color with Lab colorspace

Implement import of documents containing Type 3 fonts.

Even small documents containing images encoded with CCITTFaxDecode filter can take about 10 seconds to be opened.

When RadPdfViewer is used in a master-detail page, I should maintain the previous page index when I traverse between pages.

Please add a search option to PDF Viewer.

It will be great If you can also add a thumbnail preview option to view all pages in the PDF and a page slider to help navigate user to any page in seconds.

Allow programmatic navigation of the viewport of the PdfViewer.

By specification, names are an atomic symbol uniquely defined by a sequence of characters. However, when importing a document with names defined as an empty sequence a handled InvalidCastException is thrown which leads to missing page content.

The link annotations for the first page may not work if a document was previously shown in the PdfViewer.

For example, if you scroll down and then scroll up to the previous pages, they do not show any content.

When in single-page-mode and navigating to a page with the same size as the current, the content is not updated unless some touch interaction occurs.