how do i disable photo deletion on an iphone 12
how can i prevent someone from deleting my child's photos - can i set up a passcode for deleting photos
The Photos.app does not allow us to lock photos. We need a work-around: It is a bit involved, but if you add the photos to a note, you can protect them by locking the note (https://www.howtogeek.com/691903/how-to-password-protect-photos-on-iphone-and-ipad/)
The best protection however would be to use a passcode on your iPhone and to keep the passcode for the device secret. Do not tell anyone how to unlock your iPhone. And make regular backups of the iPhone on a computer or in iCloud to save your important photos. (a caution: the iCloud backup the iPhone will not suffice, if you are using iCloud Photos on the iPhone, because the iCloud Photos Library will not be included in the. iCloud backup of your iPhone):