Upload Resize/Compress images pdfs/rename file

I have created a web form that uploads a file that could be a pdf or image. How can I display an error message if the upload doesn't work. Maybe the file is too large. Another question is there a way to compress a pdf or shrink an image on upload.

<?php
// WA_UploadResult1 Params Start
$WA_UploadResult1_Params = array();
// WA_UploadResult1_1 Start
$WA_UploadResult1_Params["WA_UploadResult1_1"] = array(
'UploadFolder' => "cards",
'FileName' => "[FileName]",
'DefaultFileName' => "",
'ResizeType' => "0",
'ResizeWidth' => "600",
'ResizeHeight' => "0",
'ResizeFillColor' => "" );
// WA_UploadResult1_1 End
// WA_UploadResult1 Params End
?>

If these are possible, what are my settings in the above code?

You can use the bindings panel to show an error message when the upload fails. We don't have anything to compress .pdf files. Image Resizer can be used to resize images when they are displayed outside of the upload. Image resize during upload only works if you set the upload to only allow images.