In this example, we anchor PDF from adobe reader DC to OneNote, and export the anchor thumbnail.
This example need installed 2 add-ins:
Run Adobe Reader, and open a .pdf file, and keep Adobe Reader stay top most of other windows.
Next, click "Anchor to OneNote" icon on the system tray area. It will dock OneNote to the right of screen.
Create an Anchor (Linked Note) in OneNote
Click Adobe Reader again, this action keep Adobe Reader stay top most of other windows.
Type something in OneNote.
You will find An Adobe Reader icon appear on the left of you typing.
It mean that you have create an ANCHOR. An anchor sometimes include a thumbnail.
Export Anchor Thumbnail
Right click on the ANCHOR icon (Adobe Reader icon), on the pop up menu, click "Gem for OneNote" feature "Thumbnail Save As …" to export this ANCHOR thumbnail.