Glad you've got it working! There is a workaround to sync animations with video. It's a little labor intensive, but it does work, and gets easier with time. Watch your video and record the times when your specific animations should occur, and record the length of the video (in seconds).
Take this info into the audio editor. At the specific slide, choose "insert silence" and insert the seconds of the video length. (*I usually make the inserted silence one second shorter than the length of the video so the slide does not persist at all when the video is finished.) Then drag your animation points to the points on the timeline. Should work perfectly.