Question / Problem:
I have configured capturing of a couple of new fields. These fields are also shown correctly in the Verification screen, however when I attempt to draw around these fields the draw function doesn't work.
Answer / Solution:
All OCR capture is done in pre-processing and extraction, before the invoice shows up for manual verification. If you activate new fields, you will only be able to draw those fields for invoice uploaded after you activated the new fields.
If you try this on invoices uploaded after the activation it will work.