GPS Exif from iPhone photo upload in Safari?
This is a privacy feature. iOS will always strip EXIF from uploaded photos.


  It is correct that [iOS] strips exif data. This is also not a bug on [iOS] but actually a feature.


Image upload from iphone strips exif data - Stack Overflow

To access photo metadata, one needs to access the photo using an app installed on the device. To interact with Safari, this app can provide an app extension made available in Safari's share menu: Extending your App with Safari App Extensions - WWDC 2016.