TROUBLESHOOTING.md is incomplete
I think that TROUBLESHOOTING.md is not thorough enough to satisfactorily figure out why a webcam isn't working. I believe there are a good amount of cases where Snapshot 46.2 does not work.
It doesn't include info about collecting logs or gathering info about libcamera. It doesn't mention that the versions of different components should be reported.
Perhaps the portal stuff could be moved to a different section since that shouldn't be relevant for distro-packaged Snapshot 46.2.