cant upload windows server 2012 standard ISO

Hi All

I have having difficulty uploading a windows server 2012 ISO to my proxmox 2.2 boxes. Using the webGui, I get a "Parameter verification failed" message.

I then tried winSCP to upload the ISO to the local ISO folder
I also tried uploading it to my NAS's ISO folder.

The file is there, but proxmox refuses to see it. I have also tried rebooting the proxmox box.

I have tried this with both my proxmox boxes.

anything else I can try?