Patrick,ii haven't checked. But I doubt you can edit an NEF in Photo. So I'm not sure what you refer to as an edited raw file. If a photo is edited in Photo, is the default HEIC rather than JPEG? - it's a setting in Settings ...Camera/Formats .... although I might be quite wrong.
I WAS able to edit an image directly fro my Sandisc SSD plugged in via USB-C cable to my iPad Pro,,,this one:
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and this raw
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I edit all my Nikon RAW file on my iPad with Apple‘s Photo App. Every photo posted here was edited with the photo app. It works really well. I hardly ever use my computer any more for that purpose. HEIC is a setting for the camera app not for the photo app.