How do I upload movies to iCloud from an older version of iMovie: iMovie ‘09

You would need to be running at least a later version of Lyon, or possibly Mavericks, to have iCloud drive.

iMovie '09 is actually iMovie version 8. I suspect that that version might be too old for iCloud. iMovie 8 won't run on Mojave or Catalina, and possibly some of the other more recent operating systems.

-- Rich

If you have iMovie 10 on your computer you can, from within iMovie 10, do File/Update Projects and Events. That will update your iMovie 8 projects into the iMovie 10 library where they can be edited and shared out. You might have more options that way. They also will still remain in iMovie 8 unless you decide to delete them from there.

You also can share out your iMovie 8 projects as standalone movies that you can import into the Photos app.

== Rich