I have used LR 5.7 to import CR2 images from my Canon 5D mk 3 for quite some time via a card reasder without a problem. I have now bought a Canon 1DX Mk 2 and LR wont accept the upload. I get thumbnails that all say No Preview Available. This is both with a Cfast Card and a standard Compact Flash Card. I have tried uploading direct from the camera but that dosnt work either. I am not too familiar with the technical side so any simple help would be appreciated.