I use and like PhotoSync but I thought it doesn’t export unmodified originals but your edited versions. Personally I like this behavior better but that might not be what you want?

I’m not sure Apple allows any third party app to access the unmodified originals. Imagine you crop a photo to remove some embarrassing part. A third-party app can just recover that? What a privacy risk.

Of course this won’t matter if you don’t do any photo editing on iOS.