Does Cloudflare Stream Have Timeline Thumbnails?

Is it possible to have thumbnail tooltips when the user hovers over the cloudflare stream timeline, like on youtube?

It seems like the existing player supports it, because when I hover my mouse over the timeline (see pic), a small black square appears (behind the “19” in the pic). My colleague said on his browser, the box appears as a broken image icon. Yet I couldn’t find anything in the documentation of how to generate these thumbnails, or if I had to generate them myself, how to incorporate them into the stream.

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Thanks