"make it that the animations are stored in replicated storage"

-- server script 
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local anim1 = Instance.new("Animation")
anim1.AnimationId = "rbxassetid://animation1_id_here"
anim1.Parent = ReplicatedStorage
local anim2 = Instance.new("Animation")
anim2.AnimationId = "rbxassetid://animation2_id_here"
anim2.Parent = ReplicatedStorage

-- local script 
local player = game.Players.LocalPlayer
local character = player.Character
local humanoid = character:FindFirstChild("Humanoid")
local animTrack1 = humanoid:LoadAnimation(game:GetService("ReplicatedStorage"):FindFirstChild("Animation1"))
local animTrack2 = humanoid:LoadAnimation(game:GetService("ReplicatedStorage"):FindFirstChild("Animation2"))
local punching = false

local function punch()
    if punching then
        punching = false
        animTrack1:Stop()
        animTrack2:Play()
    else
        punching = true
        animTrack2:Stop()
        animTrack1:Play()
    end
end

game:GetService("UserInputService").InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.E then
        punch()
    end
end)