Azure File sync: Script to delete the files, which has been modified for certain days

Arslan11 sorry for the delay in reply. You can use the following code snippet to understand how you can find the last modified date of the blob file. Do not use this code as it is as I have copied it from our script and I have only copied the main logic but some parameters might be missing which you will be able to figure out easily.

 do
{
    Write-Output "---> Batch: $currentBatch"
    $currentBatchItems = Get-AzDataLakeGen2ChildItem -Context $storageContext -FileSystem $storageContainerName -Recurse -MaxCount $maxItemsPerBatch -ContinuationToken $continuationToken -FetchProperty
    if ($null -eq $currentBatchItems -or $currentBatchItems.Length -le 0) {
        break;
    }

    $allItems += $currentBatchItems
    $continuationToken = $currentBatchItems[$currentBatchItems.Length-1].ContinuationToken;
    $currentBatch++
}
while ($null -ne $continuationToken)

$allDirectoryItems = $allItems | Where-Object { $_.IsDirectory -eq $true }
Write-Output "--> Done - Folders and items found: $($allItems.Count)"

# Filter directories for correct conditions
Write-Output "--> Filtering directories for selected path"

## Filter for correct path level
$filteredDirectoryItems = @()
if ($null -ne $baseFolderPath -and $baseFolderPath -ne "") {
    $filteredDirectoryItems = $allDirectoryItems | Where-Object {
        $null -ne $_.Path -and
        $_.Path -ne "" -and
        $_.Path.StartsWith($baseFolderPath) -and
        -not $_.Path.Replace($baseFolderPath, "").Contains("/")
    }
} else {
    $filteredDirectoryItems = $allDirectoryItems | Where-Object {
        $null -ne $_.Path -and
        $_.Path -ne "" -and
        -not $_.Path.Contains("/")
    }
}

## Filter for expired folder based on last modified
$expiredDirectoryItems = New-Object System.Collections.Generic.List[System.Object]

$filteredDirectoryItems | ForEach-Object {
    $currentFolderPath = $_.Path

    Write-Output "---> Checking folderpath '$currentFolderPath'"
    
    $folderItemsAndFolders = $allItems | Where-Object {
        $null -ne $_.Path -and
        $_.Path -ne "" -and
        $_.Path.StartsWith($currentFolderPath) }

    $lastModifiedItem = $folderItemsAndFolders | Sort-Object -Property LastModified -Descending | Select-Object -Property Path, LastModified -First 1

    if ($null -ne $lastModifiedItem) {
        Write-Output "---> Last modified item - Folderpath: '$($lastModifiedItem.Path)', LastModified: $($lastModifiedItem.LastModified)"

        if ($lastModifiedItem.LastModified.AddDays($folderRetentionInDays) -lt (Get-Date)) {
            Write-Output "----> Folder marked for deletion"
            $expiredDirectoryItems.Add($_)
        }
    } else {
        Write-Output "---> No last modified item found.."
    }
}

I hope this helps you. Feel free to mark this as answer if you think this has helped you.