Deleting photos after moving them to a folder on iPhone

As muguy says, all the pictures are in the Library. A picture isn't in an album-- it's on a list. When you look at the Mardi Gras album, and you see picture IMG_1234, what's really happening is that the album is saying, "go to the Library and find IMG_1234 and show it to MsRobb." If the picture is not in the Library, you don't get to see it in an album.

The other thing is, if you decide to put this same IMG_1234 into the New Orleans album, too, then you need to be able to find it in Library to put it there. So disappearing from Library to be in an album would only make sense if a picture could only be seen in one place.

Do you mean into an album? That’s not a copy but a reference to the photo in the library.

por, do you mean that you move the photo into the files app instead? That creates a copy that you can delete.

All photos will always be in the library. Those that you include in an album, or any number of albums, will also remain in the library