In my similar case, in iNaturalist, when prompted to choose photos, I select Photo Gallery to choose pics, and proceed as directed by the website. The photos load, but the metadata does not, despite displaying the message ‘loading metadata’.
I compared my iPhone settings to Carrie’s (@carrieseltzer) iPhone settings, as the metadata successfully load for her. As far as I can tell so far, my software and settings match hers. (https://forum.inaturalist.org/t/am-i-doing-something-wrong-website-uploader-does-not-grab-date-location-info/22333)