The copy/paste feature is underused on iOS. These days if an app needs access to a photo, I try to determine whether the app uses the system photo picker (which doesn't need the app to have photos permission). If it doesn't I simply use the Photos app to copy a photo and then paste afterwards. A benefit is that you can strip location right from the Photos app. With third party apps like Metapho which can be invoked from the share sheet, you can even strip all metadata before copying.

Some apps like WeChat somehow insist on building on their photo picker and they get the copy/paste treatment.