How does copper get inside a via hole?

Fascinating walk through of PCB fabrication in this video from Robert Feranec featuring Kailey Shara who discussed research into DIY PCB through-hole plating:

Do you know why PCB Manufacturer may use tin to protect tracks and VIAs when your PCB is manufactured? Do you know how exactly PCB VIA plating is done? Thank you Kailey Shara for explanation

How does copper get inside a via hole?

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