First of all, thank you for this useful plugin :)
I just found an issue : when you replace an "old" .pdf file by a new one with exactly the same name, the preview generated with Google Docs Viewer is still the old one.
The only way I found to fix this is by changing the name of the new file ... and it works :)
Do you think it could be possible to fix this ?
Thank you in advance, really :)