Full access to photo library

You're right to be cautious about granting apps full access to your photo library.

However, typically, this permission doesn’t automatically mean the app can remotely access or upload your entire photo library without your further consent. Apps are generally confined to operating within the permissions you grant them on your device. They usually don’t have unrestricted access to remotely fetch or upload your photos without specific actions from you, such as selecting and uploading a photo within the app.

Apple's privacy policies and guidelines also enforce limitations on how apps handle your data. Usually, the access granted to third-party apps remains within the confines of the app's functionality and doesn’t permit unfettered remote access to your entire photo library.

Nonetheless, it's always a good practice to be mindful of the apps you grant such permissions to. Be cautious with apps from unknown or untrusted sources, as they might misuse permissions or have weaker security measures in place.

If you ever feel concerned about an app's access or behavior, you can manage app permissions in your iPhone settings. Go to Settings > Privacy > Photos to review and modify which apps have access to your photo library.

Overall, while granting access to your photo library does allow an app to interact with your media, it typically doesn't grant unrestricted remote access without further specific actions or permissions from you within the app itself.