I just got my R5MKII back from Canon for my yearly Clean N Check, went out today for a shoot, got back home, no images recored on the CF card, SD card OK, but not the CF card?? Seems like all my previous custom settings are there, so it looks like they didn't reset everything, any help PLEASE!!
It's probably a setting in your yellow menu 1-1 that assigns photo/video to each card. Check it out. Or, you could have a bad Cfe card and so it switched to your SD card.