It appears that the OCR scan function is only used for handwriting search. No consider OCR is available from PDFs or images.
The tablets that allow OCR are clumsy. I can write but need to tap, tap switch to graphic mode and draw. Then, tap tap back to write. I missed party of the talk sure to stupid tapping.
The correct way to tablet is to write to capture. Then run OCR and place the drawings into Evernote.
I doubt Evernote product management reads their forums.