All stand-alone versions of Toast Wallet (including phone and PC versions) keep only the data you provide on the device's storage. The only time this is not the case is when you generate a backup of your wallet and you explicitly copy it to some other media.
Toast Wallet will ask to access your camera if you press the QR button. It does this in order to scan a QR code for you. If you do not wish Toast Wallet to access your camera then do not press the QR code button.