CR2 file is Canon’s RAW image format, and while it’s great for high-quality images, it can be a bit tricky to open if you’re not sure what software to use.
Why not try converting? It is easy to edit the CR2 files after converting because CR2 files are always so big.
Or you have so many CR2 files to edit, JPG/JPEG is better. You can read how to convert CR2 to JPG on Mac to find some answers.
Moreover, for the conversion tools on Mac, to avoid losing privacy, iBoysoft MagicMenu is a good choice.