Can't actually get the purple scroll to move with the page scroll. (SVG draw)

Hello, I hope someone can help here as I have tried everything. There is a tutorial made about a year ago, which I have followed to the T but now, seems to have other UI changes that make it not work.

I have an SVG line draw set up, but it won't actually move with the scroll. The timeline is not linked to the scroll despite Lock to Scroll being turned on.

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