DanBHome

Just to confirm the wrong behavior: Same issue with Fujifilm X-T20: RAF files are properly displayed (with colors) if opened for regular editing, but lack color information when trying the strophotography stacking feature.
Identical behavior with DNG files created from Fujis RAF files.
Plus, I can also report a bug causing a crash:  If choosing the "Monochrome" option under "Raw Options" > "FITS Bayer pattern" with an open astrophotography stack, AP just vanishes (closes).
AP version 1.9.0.932, Windows.

Thanks Dan for your response. My camera is Fuji XE3. I shoot in RAF with no compression, yet still having the same issue. I can open images normally in Affinity Photo in full colors. However, when using the astro stacking, the picture is BW only. Actually, there seems to be color noise, but overal picture looks BW. I tried Adobe DNG converter with exactly the same results. I also tried the Iridient X-Transformer, which seems to work and images have colors even in stacking. Unfortunately I have just the demo, which puts some watermarks inside. You can guess what is the only aligned part after stacking
It would be very nice if this is eventually solved. I just started with this hobby and would very much appreciate using a single tool like Affinity Photo. Especially on Mac, this would make life easier.
Regards,
m

Hi Dan!, thanks a lot for the reply, Im using fuji xh-1 almost sure with compressed raw, will try later using uncompressed raw. Do you know if this camera (and the xt-20) are supported? Thanks!

Hi @DanBHome, @Martin S & @fedevento,
Welcome to the Affinity Forums
My sincerest apologies for the delayed response here, we are extremely busy following our 1.9 update and working from home is unfortunately extending our response window to be longer than normal, many thanks for your continued patience and understanding here.
I can confirm that the Astro-stacking feature is designed to work with RAW files, however they do need to be from a supported camera and preferably uncompressed. 
Can you please confirm for me:
What camera model do these RAF files originate from? What compression setting do you have set for these RAF files, on your camera? Many thanks in advance!

I had the same issue, meanwhile we can always use Siril, is quite good at stacking, and supports raf files, give it a try!

Same for me. I was very enthusiastic after seeing all the new tutorials and then nothing... Somewhat ruined my evening session today :(