Web Object on Feedback Master - Video

Hello,

Following the directions from a previous post, I've inserted a web object placeholder on my correct feedback master slides. On the actual slide, I've inserted the Youtube URL and want the video to hide related videos, play at 50 seconds, and end at 78 seconds (using these directions). I've gotten it to play but it plays it at the beginning. Am I missing something? Here's the published link and I've attached the SL file.

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