Hi Scott,
Thank you for Contacting Syncfusion support.
Please refer to the below steps to work with Ink Annotation in PDF Viewer
Adding ink annotation to the PDF document
The ink annotation can be added to the PDF document using the annotation toolbar.
· Click the Edit Annotation button in the PDF Viewer toolbar. A toolbar appears below it.
· Select the Draw Ink button in the annotation toolbar to draw the ink and click on the button again to end the Ink Mode
Editing the properties of Ink annotation
The stroke color, border thickness, and opacity of the Ink annotation can be edited using the edit stroke color tool, edit thickness tool, and edit opacity tool in the annotation toolbar.
Import/Export the Ink annotation:
Also, we will include the details in the UG as soon as possible and we will let you know once refreshed in online
Please try it and revert us with more details about your requirement if still have concerns on it.
Regards,
Akshaya
