Lay it flat, all four corners in frame, no glare. A photo of the document beats a photo of a screen.
The PDF your training provider emailed you works best of all — it is already clean text, so nothing has to be read off a photo.
Forward the certificate straight from your inbox. No subject line needed — the attachment is all we read.
certificates@mail.credimate.com.au
Send from the address you signed up with — that is how we know it is yours.