Pre built graphics into Media100i

Hi Folks, I'm trying to import some prebuilt graphics into media 100i 8.2.2. I've looked at the files and they do have an alpha channel embedded. I can't see my video track through the alpha (black). I've tried "import" thru M100 and thru after effects with millions colors + selected. I've laid them on a FCP project and they work perfectly. I'm am tired so I could be having a brain hiccup. What's the process? They're mov files from a disk. Do they go in the graphics trax or video trax? Please help this mindless twit! Thanks in advance for your time. Chris