How to copy files from one server to other server with powershell when the shared path contains '$' symbol - powershell

Question

I have 3 remote servers in my hand. Let us say Server X, Server Y and Server Z. I am running my powershell script from my local machine to login to Remote Server X. This Server X is my base server which has access to other 2 servers. I want to use this Server X as base server and want to copy files from Server Y to Server Z which is impossible through my local machine because of access permissions. So I logged in to Server X using admin credentials which has access to all 3 servers. After logging in, I am just mentioning copy-item command to copy files from shared path of Server Y to Shared Path of Server Z.
This is a similar question to many in this website here goes a twist. When I am debugging, it is showing completed but I am not getting any results. So I tried running this powershell script directly in Server X which contains only copy-item command and source and destination paths of shared folders. When I am debugging I am getting error that, user doesn't have permissions or path is not found. When I am trying to copy and paste files from shared path manually using the same credentials, it is working. But through powershell script, it's now working. I know the reason. It's because of symbol '$' in the shared paths. So I need the solution for this. It is not allowing '$' symbol in my source and destination paths. Is there any alternative for this? If I try to remove that symbol and copy the files, I get the 'Access Denied' Error as it is a shared path, E drive should prefixed with $ symbol.
Here goes my code:
#Calling my Server Name, Credentials from App.Config File
$currentDirectory = [IO.Path]::GetDirectoryName($MyInvocation.MyCommand.Path)
$appConfigFile = [IO.Path]::Combine($currentDirectory, 'App.config')
$appConfig = New-Object XML
$appConfig.Load($appConfigFile)
$ServerName = $appConfig.configuration.appSettings.add[0].value
$Username = $appConfig.configuration.appSettings.add[1].value
$Password = ConvertTo-SecureString -String $appConfig.configuration.appSettings.add[2].value -AsPlainText -Force
$cred = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $Username,$Password
Logging to Server X using credentials and copying files from Server Y to Server Z
Invoke-command -ComputerName $ServerName -Credential $cred -ScriptBlock {
Copy-Item "\\ServerY\E$\SourceTestFolder\Test.docx" "\\ServerZ\E$\DestTestFolder" }

Answer 1

First idea: Replace the " with '. So powershell stops to fall over the $-symbols. The way you have written it now says: "Hey powershell, go ahead and look for a variable named $E and put it in there".

Answer 2

Like previously metioned you can change the double qoutes to single qoutes. By doing this you say to powershell that everything between is a string without variables.
You can also work with a replace and a special symbol like this example.
But what if you have a string with a $ sign in the path and a varriable. something like this $cmd = "sc config something$$variable depend= something/something.
I need the first dollar sign because it is in the name of the service but then it is the variable. What i did was fix it by doing the following.
$cmd = "sc config something#$variable depend= something/something"
$cmd = $cmd -replace "#", '$'
By doing this powershell fills in the variable so i have $cmd = "sc config something#value depend= something/something"
Then I replace the # by the DollarSign and we are set.