How to move photos from one album to another to tidy up ones organization

Within Photos, how to **move** a set of photos from one album to another one to change my library organization, **without duplicating** their names? Like you can move a file within the filesystem from one folder to another without creating a new name for it ( which can be achieved with symbolic links ). My photo library is pretty well organized as a tree of folders and within, each terminal folder a set of albums each with a meaningful name. Whenever a folder or album gets too large I create new sub-folders or albums and I would like to **move** albums and photos within this modified organization but without ever creating duplicate names. I don't want for any reason any duplicate name, and moreover I don't want any pair of names which are different and pointing in fact to the same photo: a **hidden duplicate name** ( folder_1/name_A → img4928.jpg and folder_2/name_B → img4928.jpg ). Such **hidden dupplicate names** would make a labyrinth, a mess of my photo library. I already tried many key combinations while dragging: ⇧+drag, ^+drag, ⌥+drag, ⌘+drag with no success. Why does this basic function seem to be hidden or… missing? The function of moving is much more useful in real life than the one of copying, when you want to maintain a huge data collection well organized. What I am looking for here is not an explanation of the internal functioning of Photos. I know it pretty well. For example when we **copy** a photo from album *A* to album *B*, internally there is no duplication of data, but just a duplication of name, both names pointing toward the same original photo.