SOURCE
CR3
Canon replaced CR2 with CR3 in 2018. It is built on the ISO media file structure and adds C-RAW, a compressed option that cuts file size by roughly 40% with very little visible loss. EOS R, RP, R5, R6, R7, R8, R10, R50, M50, M6 Mark II, 90D and 850D all shoot CR3, and many older programs still can't read it.