Buggy server client physics stuff! (also sorry if my code is hard to look at)

[CappaDevs (nils)]

To preface, I am a new scripting.

I am trying to make a lot of movement actions in my game but they only work if I apply a linear velocity. While this linear velocity is being applied it does not update on the server correctly.

local MovementSent = game.ReplicatedStorage.MovementSent
local MovementConfirmed = game.ReplicatedStorage.MoveConfirmed

game.Players.PlayerAdded:Connect(function(plr)
	plr.CharacterAdded:Connect(function(char)
		local IsDashing = Instance.new("StringValue", char)
		IsDashing.Name = "IsDashing"
		IsDashing.Value = "NotDashing"
	end)
end)

MovementSent.OnServerEvent:Connect(function(plr, eventType) 
	local char = plr.Character
	local hum = char.Humanoid
	local HRP = char.HumanoidRootPart

	local dashForce = 150
	local dashCD = 1
	
	local function dashSound() --sound
		local dashSound = Instance.new("Sound", HRP)
		dashSound.Name = "dashSound"
		dashSound.SoundId = "rbxassetid://7273189708"
		dashSound.PlaybackSpeed = 2
		dashSound.Playing = true
		task.wait(dashSound.TimeLength)
		dashSound:Destroy()
	end

	if eventType == "Dash" and char.IsDashing.Value == "NotDashing" then

		char.IsDashing.Value = "Dashing"
		local anim = char.Humanoid:LoadAnimation(script.Dash)
		anim:Play(0)

		local debugAtt = Instance.new("Attachment", HRP) --the buggy linearvelocity stuff i had to do
		debugAtt.Name = "UDA"
		local debugLV = Instance.new("LinearVelocity", HRP)
		debugLV.Attachment0 = debugAtt
		debugLV.RelativeTo = "Attachment0"
		debugLV.MaxForce = 0
		
		coroutine.wrap(dashSound)()
		
		HRP.AssemblyLinearVelocity = HRP.CFrame.LookVector * Vector3.new(1,0,1) * dashForce -- the actual dash
		MovementConfirmed:FireAllClients(plr, "Dash")
		debugLV:Destroy()
		debugAtt:Destroy()

		task.wait(dashCD)

		if char.IsDashing.Value  == "Dashing" then
			char.IsDashing.Value  = "NotDashing"
		end
	end
end)

[UIScript]

Without reading much into this, I can already suggest that you should be doing movement stuff on the client. Players have full ownership and will automatically replicate their characters anyways, and you would want to have as little input + network lag as possible.

[CappaDevs (nils)]

Thank you! I did not know how fast this would get solved. lol