iPad with iPadOS 14.4 and Mac with BigSur 11.2 do not open (Photos) Canon R6 CR3 RAW photos.

CR3 means very little here. It's just a file suffix that a lot of recent Canon cameras use. However, Raw support Is added on a model by model basis. You can have CR3s that are supported and ones that are not. Other apps, made by other makers have their own Raw support. It's quite independent of the OS raw support. As the R6 is not on the list you'll need to wait for it to be added if you want to use Photos fro processing Raws. Or, convert it to a DNG using Adobe's free adaptor.

Have you tried to use a different compression for the RAW files from your camera? Maybe, Apple Support forgot to add the footnote "uncompressed RAW only" for this camera in the list. Just try, if you can work with uncompressed RAW files.

You can see the installed and supported RAW in the System Information. Hold down the ⌥key, while clicking the  in the upper left corner, then select "System Information". Then scroll down to "Software" in the sidebar and click "RAW support".

When I check on my Mac with Big Sur, all Canon EOS R models are missing, but the Canon EOS R.

I just remembered, that I have a second volume on the system drive, with still macOS 11.1 installed. When I boot from this volume, I can see the RAW support for the R5 and R6 installed in the system profile. And I can open and edit the sample picture.

The support must have been missing from the installer I used to upgrade from 11.1. to 11.2.

We have been cross posting, sorry. It is not a good sign, that the camera model does not show as installed on your Mac, but you may still want to check, if your Mac can at least read the uncompressed RAW, if you are using a different RAW format setting in the camera.

Ad you may want to send feedback to Apple, that your camera does not appear in the installed RAW Support list of your Mac and the format is not recognised. Feedback - macOS - Apple

Yes, after Big Sur 11.2 I can open, view and edit that Canon EOS R6 .cr3 in Photos.app 6.0 and also view it in QuickLook and Preview. This seems to be a more widespread problem for some:

https://discussions.apple.com/thread/252409757?page=2

Today I did a clean Big Sur 11.2 install on my main disk.

A few minutes ago I then checked the System report but the Canon R6 line was missing ... and QuickLook failed to open it ...

I then double-clicked the .cr3 in the Finder anticipating a failure ... but Preview.app opened it OK! And THEN R5 and R6 lines appeared in the System report and also QuickLook opened it. Photos.app also opens it OK.

Maybe the updated raw support must somehow be loaded?!

p.s. In my previous external test drive where R6 support was OK I had used the 11.1 to 11.2 updater.

That did it for me too, Matti.

After I opened the CR3 file in Preview on my macOS 11.2 Mac and then restarted Photos, the file could be opened in Photos as well. And the R6 and R5 are being shown as installed in the System Profile.

I hope, macOS Big Sur is not "thinning" the installed software to save storage, and will download the RAW support only on demand. This way we could be finding ourselves without RAW support, when away from the internet.

Canon EOS R6 raw should be supported in Big Sur 11.2 (in my setup QuickLook now displays such .cr3) and iPadOS 14.4.

https://support.apple.com/en-us/HT211241

Have you updated to macOS 11.2 Big Sur?

I can open Canon EOS R6 .cr3 in Photos.app 6.0 with my setup (mac Mini 2018, macOS 11.2).

p.s. screenshots below assembled and edited in 32-bit Photoshop CS6 13 on macOS 11.2 Big Sur with VMware Fusion 12.1.0 and OS X 10.11.6 El Capitan. Also Lightroom 6.14 (with older raw support with Adobe DNG Converter if necessary), QuickTime Player 7 Pro, MPEG Streamclip etc work but the jury is still out whether this works in larger scale (my main disk is still running Mojave).

Matti, both my Mojave Macs are showing the R5 and R6 as installed, it is only on the Big Sur Macs, where the two cameras are missing from the System Information.

Does someone have a download link to a Canon EOS R6 Raw file for testing, so I could test, if my Mac can process them, in spite of the RAW support not being listed?

Does visiting safe boot help (it clears some caches)? Does QuickLook work? AFAIR in my setup Photos could open such .cr3 for editing but I must double-check that later (I edit raw in Lightroom).