I would like to access Affinity Photo, I mean at any Affinity Photo from extensions of the Photos application and not just a few functions.
To be more specific I would like to import and store my photos in the Photos app to Apple and via extensions, to retouch them with all the functions of Affinity Photos and export (save) in Photos. Thus I proceeded with another application, Tonality Pro Macphun not quote, and it was very convenient. Photos can manage and catalog my photo library (and sync with iCloud).
This would be used as an extension Affinity Photo photos (all of Affinity Photo) or as a standalone application for those who prefer.