I added a photo and nothing was filled in. Why?

Most documents have nothing for a phone to read reliably, and that is normal rather than a fault. Truefold only reads machine-readable parts it can check for itself — a passport’s printed strip, a US or Canadian license barcode, a boarding pass barcode, a card number. A birth certificate, a property deed, an insurance policy or a utility bill carries none of those, so Truefold stays quiet and leaves the form for you to fill in. It also fills in nothing when a reading fails its own check, because a wrong detail on a document you rely on is worse than a blank field. If you photographed a passport or license and expected a result, try a clearer, flatter photo in good light — and for a driving license, remember the barcode is on the back.