Convert PDF to JPG with PHP using imagick works with flat pdf but fails when multiple layers are present

I have an internal job management download page for downloading PDFs. The script saves a copy of the pdf file to one directory and then a copy of the jpg is created using imagick, which is used to display on another page. Most PDFs loaded with the script work fine (albeit a bit slow and the memory consumed ... but still works as intended). We work in the service industry and many of the downloads are drawing sets. Drawings exported from cad usually have a whole bunch of layers and these documents fail with the following message:

Fatal error: Throw "ImagickException" with message "Postscript delegate failed" .. /../Dropbox/Job_Docs/15-0273 La Bella, Cassandra / 15-0273 La Bella, Cassandra-layout 6-22-2015 55876fa96aa00. pdf ': No such file or directory @ pdf.c / ReadPDFImage / 611' in / home / solargai / public _html / dash3 / upload.php: 79 Stack trace: # 0 / home / solargai / public_html / dash3 / upload. php (79): Imagick -> __ construct ('../../ Dropbox / J ...') # 1 {main} thrown into / home / solargai / public _html / dash3 / upload.php on line 79

So, if I save one of these pdf issues to my desktop and then save it again via a pdf printer (cutec in this case), try downloading it again, it works great. So of course I am assuming they are layers ... because they are removed and flattened when I use a PDF printer.

At first I thought the document size was related, but then I realized that I could go through almost 100 pages without crashing (a set of drawings is usually 15 pages or so).

    <?php

set_time_limit(0);
ignore_user_abort(1);

session_start();



$uuid = uniqid();
$today = date("n-j-Y");

$jobname = $_POST['jobname'];
$_SESSION['jobname'] = $jobname;
$uploadType = $_POST['uploadType'];
$writeSTATE = $_POST['writeSTATE'];
$fileName = $jobname."-".$uploadType." ".$today." ".$uuid;

$fileNamePDF = $fileName.".pdf";
$path = "../dash2/jobinfoDOCS/".$jobname."/".$uploadType."/";
$DOCSpath = "../../Dropbox/Job_Docs/".$jobname."/";

//////remove directory
if($writeSTATE == "overwrite") {

        $filesD = glob($path . '*', GLOB_MARK);
        foreach ($filesD as $fileD) {
            if (substr($fileD, -1) == '/')
                delTree($fileD);
            else
                unlink($fileD);
        }
        rmdir($path);

}
if (!file_exists($path)) {
    mkdir($path, 0777, true);
    //echo "created folder for path: " . $path;
}
if (!file_exists($DOCSpath)) {
    mkdir($DOCSpath, 0777, true);
    //echo "created folder for path: " . $DOCSpath;
}



//echo "upload type: " . $_POST['uploadType'] . "<br>";
//echo "path: " . $path . "<br>";

//echo $_FILES['layout']['tmp_name'];
   if (is_uploaded_file($_FILES['layout']['tmp_name'])) {
      if ($_FILES['layout']['type'] != "application/pdf") {
         //echo "<p>Class notes must be uploaded in PDF format.</p>";
      } else {
         $name = $_POST['name'];
         $result = move_uploaded_file($_FILES['layout']['tmp_name'], $DOCSpath.$fileNamePDF);

///write pdf to jpg 

       //  if ($result == 1) echo "<p>File successfully uploaded.</p>";
         //else echo "<p>There was a problem uploading the file.</p>";
      } #endIF
   } #endif

$fi = new FilesystemIterator($path, FilesystemIterator::SKIP_DOTS);
//printf("There were %d Files", iterator_count($fi));
$fileCOUNT = iterator_count($fi);
//echo $fileCOUNT;

$PDFpath = $DOCSpath.$fileNamePDF;

$img = new imagick($PDFpath);
$img = $img->flattenImages();
$img->setResolution(175,175);
$number = $img->getnumberimages();
for($i=0;$i<$number;++$i)
{
$count = $i + $fileCOUNT;
    $JPGpath = $path.$count."--".$fileName.".jpg";
//echo $PDFpath."AND".$JPGpath;
$img->readImage("{$PDFpath}[".$i."]");
$img->writeImage("{$JPGpath}");
}
header("location:index.php");
?>

      

        
        
        
      

    

I tried adding "flattenImages" underneath "new imagination" and it didn't help anything. I also tried to isolate the function and use tmp files to create the imagick function. There were a bunch of other things I tried too, and I have been messing around with all the weekends at the moment and I just got stuck so any help would be greatly appreciated.

If it helps illustrate the link for the layered pdf causing the problems is below: https://www.dropbox.com/s/unauyb0rzpk0nup/drawing_with_layers.pdf?dl=0

then here is a copy that downloads successfully which was launched by the cute PDF author https://www.dropbox.com/s/dv0bt7x222s93mi/no_layers.pdf?dl=0