I would like to know if I can alphabetically sort albums in Photos.app. The iPhoto method for doing this did not work.
If you’re talking about sorting your list of albums alphabetically, go to View → Show Sidebar or press ⌘ cmd ⌥ alt S. Then right-click Albums in your sidebar and choose Sort → By Name.
If you’re asking about sorting the photos inside an album alphabetically, right-click that album in your sidebar and choose Sort → Keep Sorted By Title. Note that most photos won’t have a title, and Photos will next sort by date taken.
I had all kind of problems with album sorting across various devices. Please take a look