[Osiris]

Another issue that comes up in these scenarios is after denying to change your mind. How do you give the app access now?

It's often not straight forward and often getting in some system settings somewhere. Android has this problem.

[mathemagics]

Had the same concern, but the dialog tells you how to change it. Not only that, it'll take you directly to the correct location in system preferences, where all the apps & their permission status are listed.