Just use the app
Open Mupi like any other camera app. Nothing to set up, nothing locked down.
Find an old iPhone, install Mupi, hand it over. The rest is meant to stay out of the way.
Step one
Any iPhone running iOS 15 or later will do. Charge it, install Mupi, and give the child's camera a name.
Step two
One press of the shutter takes one photo. It is written to the camera immediately, so nothing depends on a signal or on your phone being nearby.
Their photos go into their own gallery, which they can look through whenever they like.
Step three
When the camera has a connection, photos copy into your family's iCloud storage. If it does not, they wait on the camera and go later. Nothing is lost in between.
Step four
Open Mupi on your iPhone, open your child's library, and save the ones you want into Apple Photos. Everything else stays where it is.
Open Mupi like any other camera app. Nothing to set up, nothing locked down.
Guided Access holds the iPhone in Mupi until you unlock it, using what iOS already has.
How to set that upAn old iPhone can be set up so Mupi is what the device does, the way a camera only takes photos.
How to set that up€14.99 once. No subscription.