Up front - I just started to use a Pi for Astro. Apparently I'm starting on a new Polar Alignment tool in KStars 3.5.2 running on my Mac. I have Astroberry running on a Raspberry Pi 3B+.

My INDI logs on my Canon EOS RP driver says the following when attempting to image/solve. Also, I'm able to see a single image if I use the camera and "Capture a preview", and I can see each image if I setup a sequence.2021-04-22T02:54:02: [ERROR] Exposure failed to parse raw image.
2021-04-22T02:54:02: [ERROR] Cannot open /tmp/indi_fZDGyw: Unsupported file format or not RAW file
2021-04-22T02:53:59: [INFO] Starting 1 seconds exposure.
2021-04-22T02:53:59: [ERROR] Exposure failed to parse raw image.
2021-04-22T02:53:59: [ERROR] Cannot open /tmp/indi_xJVBv2: Unsupported file format or not RAW file
2021-04-22T02:53:55: [INFO] Starting 1 seconds exposure.
2021-04-22T02:53:55: [ERROR] Exposure failed to parse raw image.
2021-04-22T02:53:55: [ERROR] Cannot open /tmp/indi_havdaa: Unsupported file format or not RAW file
2021-04-22T02:53:50: [INFO] Starting 1 seconds exposure.
2021-04-22T02:52:20: [INFO] Detected Canon.Inc Model Canon EOS RP.Thoughts?

I figured out the issue, the pixel size was not correct in KStars. I can't seem to set the Bits per pixel to 14 though, which is what I see on a specification page for my camera. Now I just have to test on a clear night.  

Oops. The max width and height somehow changed. Even after fixing, I still can't set the bits per pixel to 14.

I would say that this is still an issue. I just realized the only way I got this to work with the correct pixel size was that I also set it to JPEG. If I select RAW or cRAW on the INDI driver config, the new 3.5.2 Polar Alignment does not work.

I think this is related to this thread. indilib.org/forum/ccds-dslrs/6707-canon-eos-ra.html