How would I update a localscript to work with FilteringEnabled?

My script goes like this

local plr=game.Players

msg=workspace.Message
msger=msg.Messager

SendMsg=script.Parent

SendMsg.Button1ClickedDown:connect(function()
msg.Value=script.Parent.Parent.TextBox
msger.Value=plr.Name
end)

When I press the send button, the text goes to a stringvalue in workspace, and I didn't write the other part of the script but I'm using .Changed to sync a message GUI's text with the value in workspace. However, this only affects the player that sent the message, so how would I update it so it's client AND server?