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[PCB Prototype] Difference between Via filled with resin and Via filled with copper

What is the difference between Via filled with resin and Via filled with copper?Why I can't select via filled with copper on the website for my PCB?
Ranking Name Answers
1 PCBWay Team 5
2 Alice Brown 2
3 Engineer 1
4 Julian Eballa 1
5 James Youngs 1