I'm totally puzzled. Sometimes, I can export photo files from Photos, rename them, then import them with the new file name and it stays. But sometimes, I'll see the file with the new name for a fraction of a second on import and then it reverts to the original name. What's going on? I'm totally tired of having to work around an application that makes it as difficult as possible to get what you want–names for your files that are logical, orderly and make sense!