it still doesn't work, updated yesterday to Big Sur. SD card doesnt show up in the finder's sidebar, you can only show the SD Card on the desktop if you chose to show external drives on the desktop (preferences in finder, 1st Tab)
Needless to say that I absolutly regret installing Big sur! All of you who have not updated yet and if you're working with FCPX, Luminar and alike - stay away from an upgrade to Big Sur.