I've been editing on linux with resolve since the launch of the BMPCC4K in 2018, were you trying to import MP4 footage? BMD can't be bothered to pay for the AAC audio codec for linux users even if they buy studio. So if you pay for studio you can read the h264 video stream but not the AAC audio. I end up converting everything to MOVs with pcm_le16 audio as a workaround.
The ALSA issues are beyond aggravating at this point. You do not want to actually run ALSA directly, you need it to connect to pulseaudio on 24.04. But I still have never been able to record audio within resolve. I've had mixed luck on newer wayland+pipewire setups with having to install the bridge packages to connect the different backends. Linux audio is cursed on its own so I don't fully blame BMD.
I exclusively run Kubuntu and have been using makeresolvedeb[1] for installing resolve and it has been pretty good.