SUMMARY
On Digikam 7.2 and 7.3, the camera list is empty.  And auto-detect
doesn't work.  (obviously 7.0 and 7.1 don't work on Big Sur, so didn't
try those.) To add a generic USB PTP Class Camera, I had to manually add it.  But
it still doesn't work.  In fact, when I try to do an import of images
from my android phone set to PTP mode, Digikam immediately crashes.

Digikam 6.4 works very well on Big Sur.  None of the above issues are problematic on 6.4.  I was able to select the USB PTP Class Camera from the camera list, and importing works very well. Once I had a 6.4 install working, I then tried separate upgrades to both 7.2 and 7.3.  The USB PTP import process still causes Digikam to
immediately crash.

I tried:
export QT_LOGGING_RULES="digikam*=true"
/Applications/digiKam.org/digikam.app/Contents/MacOS/digikam

And what I saw was Segmentation Fault 11.

STEPS TO REPRODUCE
1. Install either version.
2. Create USB PTP Class camera setting, if it doesn't already exist from an upgrade.
3. Try to import from phone in PTP mode.
4. Digikam crashes.
5. If logging, you should see "Segmentation Fault 11"

OBSERVED RESULT
Digikam immediately crashes.  I only see segmentation fault 11, if I set: export QT_LOGGING_RULES="digikam*=true"

EXPECTED RESULT
Successful display showing pictures that can be imported from my phone to Digikam.


SOFTWARE/OS VERSIONS
macOS: 11.6