GUI won't become Visible after RemoteEvent fires via a ClickDetector?

Take 3, turns out my last two questions were for naught and weren't actually my problem.

I need my GUI named "Cover" to become Visible after a RemoteEvent is fired through a ClickDetector picking up a click. However, it seems that either my RemoteEvent isn't firing to the player who clicked/not firing at all, or my onClientEvent isn't picking up the RemoteEvent.

Here are the placements of the scripts:

https://i.imgur.com/vW27kLe.png (My ClickDetector in its parent model, with its script to tell the RemoteEvent to fire)

https://i.imgur.com/qwJ09Bz.png (My RemoteEvent in ReplicatedStorage)

https://i.imgur.com/PtMdNNw.png (My script CoverVisible, which should receive the RemoteEvent and tell the ImageLabel above it to become Visible)

Before I get questions about it: yes, the ScreenGui the ImageLabel is under is Enabled, and the Frame it's also under is Visible.

Here are my scripts:

DinosaurBookOpen (should receive the click from the ClickDetector and tell the RemoteEvent to fire to the player who clicked the model)

local clickDetector = script.Parent

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local remoteEvent = ReplicatedStorage:WaitForChild("DinosaurBook")

local function onClicked(player)
    remoteEvent:FireClient(player)
end
-- Connect the function to the MouseClick event
clickDetector.MouseClick:Connect(onClicked)

CoverVisible (should receive the RemoteEvent and tell the ImageLabel to become Visible)

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local remoteEvent = ReplicatedStorage:WaitForChild("DinosaurBook")

local GUI = script.Parent

local function onNotifyPlayer()
    if GUI.Visible == false then
        GUI.Visible = true
    end
end)

remoteEvent.OnClientEvent:Connect(onNotifyPlayer)