Copy-Item does not work with FileSystemWatcher - powershell

Question

I'm trying to create a watch folder on a network share that simply copies files (300mb-20gb) in size to a destination folder. The FileSystemWatcher and subscription works great with small files (i.e. 1-3kb). However, larger files do not copy. I do see a copy is triggered in the verbose stream, but no file is copied to the destination folder.
$Folder = "\\10.11.233.91\vol_tx01\delivered_media"
$Filter = "*.mxf"
$destination = "C:\Users\Leeds TX 11\Desktop\support\Testy"
$Watcher = New-Object IO.FileSystemWatcher $Folder, $Filter -Property #{
NotifyFilter = [IO.NotifyFilters]'Filename, LastAccess'
}
$onCreated = Register-ObjectEvent $Watcher Created -SourceIdentifier `
FileCreated -Action {
$path = $event.SourceEventArgs.FullPath
$name = $event.SourceEventArgs.Name
$ChangeType = $event.SourceEventargs.ChangeType
$Timestamp = $event.TimeGenerated
Write-Host "The file '$name' was $ChangeType at $Timestamp"
Copy-Item $path -Destination $destination -Force -Recurse -Verbose
}

Answer 1

Combination of issue were at hand. Firstly thank you JohnLBevan for pointing out LastWrite should be the notifyfilter to use. Also found that in this case copy-item does not wait for the file transfer in the source directory to close. I fixed this by putting in a while loop waiting for the file to be locked:
##################### DANGER BOX ####################################
$Folder = "C:\Users\Leeds TX 12\Desktop\Source" #Source dir
$Filter = "*.mxf" # MXF Filter
$destination = "C:\Users\Leeds TX 12\Desktop\Destination" # Destination dir
################### Watch for file system events###########################
$Watcher = New-Object IO.FilesystemWatcher $Folder, $Filter -Property #{
NotifyFilter = [IO.NotifyFilters]'LastWrite, Filename'
}
################### Register filesystemwatcher & subscribe to notifyfilters #################
$onCreated = Register-ObjectEvent $Watcher Created -SourceIdentifier filecreated -Action {
$path = $event.SourceEventArgs.FullPath
$name = $Event.SourceEventArgs.Name
$ChangeType = $Event.SourceEventargs.ChangeType
$Timestamp = $event.TimeGenerated
write-host "The file '$name' was $ChangeType at $Timestamp" # Debug
################# Wait for file lock collapse #########################################
while($True)
{
Try {
[IO.File]::OpenWrite($path).Close()
Break
}
Catch { Start-Sleep -Seconds 1}
}
#################### Copy item #############################
Copy-item $path -Destination $Destination -force -Recurse -Verbose}