Cannot see all of my iTunes home movies in Apple TV with Home Sharing enabled

On my iMac, I created a slideshow using iMovie, saved it to a local file as a .mov, and imported it into iTunes. I can see the new home movie in iTunes, along with 26 other older home movies. When I go to my Apple TV that's connected to my TV far away from my iMac, under 'Computers' I can see my home movies (Home Sharing is enabled), but only 20 of them appear, and the new one that I want to play isn't visible. I know some of the visible home movies are also .mov so it's not the file format. How can I get Apple TV to see my latest home video created by iMovie in iTunes? I have guests coming over tomorrow to see this movie so I really need to get around this problem quickly and I missed the open window of Apple Support. Thank you for any advice you have that will help me!