How Netflix did Black Mirror's Bandersnatch

This is a "How to", to show you how you could do something like Netflix's Black Mirror - Bandersnatch interactive video. It's just an overview on how it could be replicated with almost no money.

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[Hamhada]

I completed production according to the video, but the button will automatically appear over time even if the video is not played on the website. The button appears automatically when it is not the right time for the option to appear. Is there any way to fix this?
Also, I wonder if there is a way to render the video separately other than on the website.

[francistrevett]

Nice work mate! I would love to be able to use this technique in my work.

Interactive video would be great for YouTube.
How would you show your video to the public after this process?