Some distractions in the meantime, but I watched Chris Kovac's video and had a look at Rob's repo. I decided to try Chris' approach and built a new image, but ended up with the same problem - it is unable to process raw files from my camera.

I decided to try StellarMate as it is basically a curated and very up to date build of the same parts, with added extras. That worked with my camera "out of the box" (I only bought the OS and installed onto current pi4).

So I now have a properly working system and am getting everything set up.

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