How to share a slide show movie (m4v) to iCloud shared file.

I created a slide show in iTunes (12.9.95) then saved it to my Mac Book Pro (10.14.6) desktop as an m4v file. I did select "send it to iTunes" but I don't see where it saved.

Now, I would like to share the movie to my shared file in iCloud, but I cannot figure out how to do this. Please help if you can. Thanks!