Thanks for the reply Mike. I have just bought the Nikon d7500 yesterday and I can edited nef (raw) files in affinity. Now the problem is that I use Apple Photo which doesn't support the Nikon 7500 raw files so I am unable to open RAW image and transfer the RAW image to affinity with Photos. I have to transfer the image from Photos to Pictures in Finder which opens both the jpeg and raw image and then I can open the image in affinity. Hope that makes sense to you. I have spoken to Apple Care and Nikon about adding Nikon 7500 to Photos but they each say the other company is responsible for adding the software. Hopefully they work it out soon.
What file management system do you use?