In System Preferences > Security & Privacy > Privacy both Bridge and Photoshop have Full Disk Access. So Adobe Bridge recognises the image files on the CFExpress card in the camera but not in the CFExpress Sandisk card reader. If the camera, containing the Sandisk CFExpress card is attached directly to the computer via a USB3.1 cable, the images on the card can be transferred using Adobe Bridge Photo Downloader into a pre- selected folder.

With the the CFExpress card mounted in the Finder as an EOS Digital disk the images on the card are available (EOSDigital >DCIM >100EOS1D > _W1I0451.CR3 etc) and may be directly transferred by drag and drop onto the computer desktop or into an appropriate folder.

The CFExpress card appears in the Finder as a mounted disk (EOS_Digital). So the computer sees the CFExpress card reader. The Sandisk CFExpress card reader hardware, with the CFExpress card inserted, is recognised by my computer (Applications >Utilities >System Information > Hardware >USB) as 'Sandisk SDDR-F451' which is also shown on the reverse side of the card reader. So the problem does not relate to the file type CR2 files on a CFast card placed in a Lexar CFast card reader are downloaded by Bridge Photo Downloader.

The Adobe Bridge Photo Downloader does not recognise the CFExpress card in the Sandisk CFExpress card reader regardless of whether the card contains. The Downloader responds with 'No Device Found'. Using a Canon EOS 1DX Mk III camera, with Adobe Bridge v10.0.4.157, I am unable to download my images from a Sandisk 64gb CFExpress card via a Sandisk CFExpress card reader to an iMac Pro (macos Catalina) using my usual workflow of Bridge > Bridge Photo Downloader > Get Photos From Camera.

Adobe bridge photo downloader error