Need to access files on a NAS (with credentials); New-PSDrive, Net Use?

I simply tried to access a Nas with "Join-Path" but sadly you can not use credentials for that. Now Powershell tells me about "New-PSDrive" to use and in the internet I find plenty of pages about "Net Use". I looked them up both but none of them were understandable for me.

Which one would you use and can you explain why and propably also how, so I will understand how that works?

Here's my script so far:

$serveraccname = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Swisscom\SWDPSInstaller" -Name "Server Accountname")."Server Accountname"
$serveraccpwd = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Swisscom\SWDPSInstaller" -Name "Server Accountpwd")."Server Accountpwd" | ConvertTo-SecureString
$cred = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $serveraccname, $serveraccpwd
$install = Join-Path ($config.Installer.GlobalSettings.SourcePath) "\Notepad++\Notepad.exe" -Credential $cred

Of course, that's not all. It's just the part where I need to connect to the NAS.

($config.Installer.GlobalSettings.SourcePath)

That part is the NAS and the folder on the NAS. It's something like this: \\NAS01\Folder (I used XML there)

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