accessing a $_SESSION variable is failing

Try this and let me know if it works.

PHP Code:

$cmd = "soffice --convert-to png {$inputFile} --outdir {$ouputDirectory}"; 


The problem is getting the $inputFile.


$inputFile="/app".$field_info['upload_path'];

This is in a call back where $field_info is  a structure being passed to the callback. upload_path contains the full path to the file that was just uploaded. I need to add /app onto the front of it. But I can't seems to access $field_info['upload_path']. 

proof that an old dog can learn new tricks