How to copy client replicated storage to server replicatet storage

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2

Try using a Remote Event and sending the data needed to the server.

Client Script:

DemoEvent:FireServer(data)

Server:

DemoEvent.OnServerEvent:Connect(function(data)
 print(data) -- the server will receive the data
end)

Here is more info on how: Custom Events and Callbacks | Documentation - Roblox Creator Hub