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Is there a good demo that shows ... how this looks / works?

The site mentions a video, but I can't find it.

There's a button on the homepage "Watch How It Works", does that not open for you?

Watch button works, I just missed it and went to the FAQ that mentions the video there, but the FAQ doesn't link to it. My bad, TY.

No problem. You can use the upload form on the homepage as well, it doesn't require a sign up.