My sample slide has movies of 2 cardiograms (heart surgery movies). The 1st plays automatic and the 2nd starts after it finishes – which is the typical animation setup I have seen on hundreds of medical slides.
To make both movies play simultaneously:
1. Select the 2nd movie
2. Change AFTER PREVIOUS to WITH PREVIOUS
3. Open the Animation Pane and verify video are set in needed animation sequence
– Troy @ TLC