PhotoPA for iPhone, iOS 17 and later
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In your photo library, where they already were. PhotoPA remembers which photos are in a collection and shows you the originals. It never makes copies, and it never recompresses them.
That photo is no longer in your library. Open the collection's editor and swipe the row away to remove the slot.
PhotoPA needs permission to read your library. Settings, PhotoPA, Photos, then allow access. The app will not show anything until it can read the photos you chose.
Tap Restore purchases on the same screen. The purchase is tied to your Apple Account and works on any iPhone you sign in to.
Not without Face ID, Touch ID or your passcode. Turning on Face ID for a collection means it will not open without you. Leaving a collection is free; it is opening one that is guarded.
Not from inside PhotoPA. No iPhone app is allowed to block the home swipe or the app switcher, and one that tried would not be approved.
iOS does it properly instead, with Guided Access. It locks the phone to one app until you authenticate, and it is enforced by iOS rather than by us, so there is nothing to work around.
Turn it on once in Settings › Accessibility › Guided Access. In Passcode Settings, switch on Face ID so that your face is what ends it. After that, triple-click the side button to start a session before you hand the phone over, and triple-click again to end it.
The two work well together: Guided Access keeps them in PhotoPA, and a locked collection stays shut even while they are in there.
Yes. PhotoPA makes no network connections at all, so a hall with no reception changes nothing.
Touch and hold the collection on the home screen, choose Edit, then drag the rows. The first one is the cover, and the photo you land on when you open the collection.
Touch and hold is also how you rename, duplicate, pin or delete a collection, and how you turn the Face ID lock on or off after it has been created.