I've a production model of the camera.
Using a USB cable, I can ingest from the Sandisk CFExpress card reader without issue.
But, connecting the camera directly with a USB cable, PM doesn't see it. But, I can use Canon's EOS Utility, I can download the images, and then read them with PM.
Also, now selecting the Canon HEIF format, .HIF files, PM can't read those. I have to use Canon's DPP to read them, to export to jpg.