How To Transfer File Between 2 PSDrives - powershell

Question

I created two PSDrives on my client computer PowerShell session to two different Remote Servers.
New-PSDrive -Name DllFrom -PSProvider FileSystem -Root "\\WPDHSFMSLxx\adap\Database\Install\KareAssistTest\HIDn"
New-PSDrive -Name DllTo -PSProvider FileSystem -Root "\\WTDHSAPPLxx\d\ServerDLLDev"
I can dir either one and contents are displayed.
I can't copy a text file between these 2 drives using Copy-Item:
PS C:\WINDOWS\system32> Copy-Item DllFrom/HelloWorld.txt DllTo/HelloWorld.txt
Copy-Item : Cannot find path 'C:\WINDOWS\system32\DllFrom\HelloWorld.txt' because it does
At line:1 char:1
+ Copy-Item DllFrom/HelloWorld.txt DllTo/HelloWorld.txt
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (C:\WINDOWS\syst...\HelloWorld.txt:String) [
+ FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.CopyItemCommand
I changed the location to the DLLFrom drive and tried it.
Set-Location DllFrom:
PS DllFrom:\>Copy-Item HelloWorld.txt DllTo
and
PS DllFrom:\> Copy-Item \\WPDHSFMSL03\adap\Database\Install\KareAssistTest\HIDn\HelloWorld.txt DllTo
Nothing happened, command line refreshed, but no file showed up.

Answer 1

DllFrom and DllTo are drives, and need a colon in their name when you refer to them. You create them with a -Name without the colon, but later use it when using the drive, just like a single letter drive C: or other providers like HKCU:
Try: Copy-Item DllFrom:/HelloWorld.txt DllTo:/HelloWorld.txt
There is more overview on PSDrives at 4sysops. From the linked page:
Remember that the PSDrive name does not include the colon (:) but you need to include it when using the drive to set location.
When you did Copy-Item HelloWorld.txt DllTo, you'll find a copy of HellowWorld.txt in your current directory named "DllTo"