How do I apply a Scale/Zoom In animation to all photos in a video timeline?

I've got a simple slideshow with a bunch of photos in a video timeline.  After I apply a Zoom In animation, I cannot apply the scale animation to all of the photos.  If I use the "Animate all" option at the top of the animations pallet, it only gives me "bloom", "glide"...etc options.  NOT scale or zoom.

The three dots on the element in the timeline allow me to apply the duration to all, but not the animation.  The "animate all" in that same pop-out doesn't seem to apply that scale/zoom in animation to anything else in the timeline.

I had to apply the scale/zoom over and over to every photo in the timeline.  What have I missed?

Thanks.