Hi Jim -
Came across a slight nit in Help:
Creating an Annotation File: DEVONthink has a built-in default annotation file in rich text format, suitable for general use. However, you can create your own custom template in plain text, rich text, or Markdown formats. These files can be created externally and added to ~/Library/Application Support/DEVONthink 3/Annotations.noindex or created in DEVONthink and exported via [File > Export > as Template](file:///Applications/DEVONthink.app/Contents/Resources/DEVONthink.help/Contents/Resources/pgs/menus-file.html#importexport) to the Annotations.noindex folder.
still refers to DEVONthink 3 folder in ~/Library/Application Support