Problem still exists, I’m unable to use a background or logo image with the certificates.
I get this log message on the QSM help screen when trying to use the image file migrated over:
FPDF error: Missing or incorrect image file.
Or get this message when trying to use a new image file:
FPDF error: Can’t open image file.
Permissions are fine on that folder and the rest of WordPress doesn’t have any issue using media from the same folder.
For now I’ve removed the background image from all 130+ surveys in order make the certificates work but would like to resolve this and add the background image in again.