RAW FORMATS PROBLEM

I can't open the RAW files from my IPhone 14 pro max in Affinity photo2 app. Anytime I do it the file format changes to JPEG format, consequently instead of opening in develop persona which is for RAW files processing it opens in photo persona as jpeg. I have already set the RAW files on camera setting. the interesting thing is that these files shows as a RAW files in photo app both on my IPhone and iMac desktop. As I searched online by Affinity photo community, this app supports IPhone RAW files. why? Please guid me if I make any mistakes. thanks.