Hey Vex,
This got accepted for some reason, which takes it off my to-do list. So I was trying this out in 4.12.5 and could not actually get it to happen.
I have a simple cinematic, which has one object moving and a camera. I do not enable Auto-Play or have anything on BeginPlay. Then I Simulate and try to scrub through and play from the Sequencer Editor. You’re saying this should play the animation?
You had mentioned streaming the functionality. Could you instead capture and upload to youtube?