Only if verifiable=any as well, because if that isn’t specified it defaults to only verifiable observations. It doesn’t look like you can manipulate that in the photo browser though, and I’m not sure the photo browser will default in the same way.
These load the same thing:
https://www.inaturalist.org/taxa/1047387-Capra-hircus-hircus/browse_photos?quality_grade=any
https://www.inaturalist.org/taxa/1047387-Capra-hircus-hircus/browse_photos?quality_grade=any&verifiable=any
As do these:
https://www.inaturalist.org/taxa/1047387-Capra-hircus-hircus/browse_photos
https://www.inaturalist.org/taxa/1047387-Capra-hircus-hircus/browse_photos?verifiable=any
So maybe the photo browser is set to only verifiable observations. (There’s also the possibility I didn’t enter those URLs correctly.)