$AppRegistrationId = "<App Registration>"
$SiteURL = "<Site URL>"
Connect-PnPOnline -Url $SiteURL -Interactive -ClientId $AppRegistrationId
$SiteName = Get-PnPWeb
$ReportDate = Get-Date -Format "yyyy-MM-dd"
$InactivePeriod = (Get-Date).AddYears(-1)
$ReportOutFile = "./" + $SiteName.Title + " - " + $ListName + " - Version Report - " + $ReportDate + ".csv"
"DocName,DocURL,DocID,DocSize(Bytes),Modified,Created" | Out-File -FilePath $ReportOutFile

$InactiveFiles = Get-PnPListItem -List "Documents" | Where-Object { $_["Modified"] -lt  $InactivePeriod}

ForEach ($File in $InactiveFiles){
    
    $File.Id
    $FileInfo = $File.FieldValues.FileLeafRef + "," + $File.FieldValues.FileRef + "," + $File.Id + "," + $File.FieldValues.File_x0020_Size + "," + $File.FieldValues.Modified + "," + $File.FieldValues.Created
    $FileInfo | Out-File -FilePath $ReportOutFile -Append

}