Hi DeputyDawg,
Welcome to Affinity Forums.
The methods R C-R outline above only allow you to open images from Apple Phopto. as JPG's. If you want to open the original RAW files for editing you have to use the Edit in Affinity Photo extension for Apple Photos to send the RAW's to Affinity Photo or export them manually from Apple Photos as originals (menu File ▸ Export ▸ Export Unmodified Original) to a folder on your computer and then open them in Affinity.