Is it possible to use Azure Automation Runbook to delete another Runbook output (an Azure File share snapshot)?

I want to use the runbook to delete another runbook output (an Azure File Share snapshot).

Is it possible? If you know something, please write something at here

Runbook 1: Create an Azure File share snapshot

$context = New-AzureStorageContext -StorageAccountName -StorageAccountKey 
$share = Get-AzureStorageShare -Context 
$context -Name "sharefile" 
$snapshot = $share.Snapshot()

Runbook 2: Delete the Azure runbook output. The problem with this is that it deletes all snapshots rather than just delete the one created by the first runbook.

$allsnapshots = Get-AzureStorageShare -Context $context | Where-Object { $_.Name -eq "sharefile" -and $_.IsSnapshot -eq $true } 
foreach($snapshot in $allsnapshots){ 
    if($snapshot.SnapshotTime -lt (get-date).Add·Hours()){ 
        $snapshot.Delete()
    }
}

The sample code is as below, I test it in runbook and works well(create a snapshot, and then delete it after 3 minutes), and the other snapshots have no effect.

code in my powershell runbook:

param(
[string]$username,
[string]$password,
[string]$filesharename
)

$context = New-AzureStorageContext -StorageAccountName $username -StorageAccountKey $password
$share = Get-AzureStorageShare -Context $context -Name $filesharename
$s = $share.snapshot()

#get the snapshot name, which is always a UTC time formated value
$s2= $s.SnapshotQualifiedStorageUri.PrimaryUri.ToString()

#the $snapshottime is actually equal to snapshot name
$snapshottime = $s2.Substring($s2.IndexOf('=')+1)
write-output "create a snapshot"
write-output $snapshottime

#wait 180 seconds, then delete the snapshot 
start-sleep -s 180

write-output "delete the snapshot"
$snap = Get-AzureStorageShare -Context $context -SnapshotTime $snapshottime -Name $filesharename 
$snap.Delete()

write-output "deleted successfully after 3 minutes"

after it's running, you can see the snapshot is created in azure portal:

After it completes, the specified snapshot is deleted(you may need to open a new webpage to see the change due to some cache issue)

the output in runbook: