If you have a Dji RC shipped with Dji mini 3 pro you can insert a mini-sd card. So i tried it with photos/videos made with the drone.
I thought you can view them on the Dji RC... but how....??

Did you tap on Album on the Fly App?  You should see the cached files there.  The HiRes files are stored on the Drone internal memory of it's SD Card if you are using one.

This video also might help you out on the photo question.  Start at 7:22.

If you swipe down you should get a notification that the SD card was inserted with an option to explore it.   The SD slot is really for caching copies of video and screen recording rather than browsing the drone sd card.