THANK YOU! I had that exact language, but with 2 equal signs! Woops. Thanks for the help @h_classen
Slider is on separate timeline named, "sliderTime" tweening from beginning to end
Video is on Main Timeline named, "theVideo"
On Drag for the slider add "Control Timeline" "sliderTime" first
hypeDocument.getElementById('theVideo').currentTime = hypeDocument.currentTimeInTimelineNamed('sliderTime');
works like a charm!