I never said the Photos app displays both the raw and jpg, only that both are present in the iPad storage. There are other apps, including Lightroom and FSN Pro and Photosync, that allow one to selectively bring either the raw or the jpg into the app. The images are all in the Photos sandbox, therefore the api must allow either to be extracted, as evidenced by the other apps.
My workaround for Affinity is to view the image in Photosync, which picks the jpg for view mode, and "export" it to Affinity. However, I believe to be truly full functioned, Affinity should allow either to be imported, depending upon the intent of the user.
I've attached a screenshot of Photosync on the iPad, showing how it represents the Photos storage, which I find very useful.
Richard Southworth