I am running FMP Server advanced and IWP. I'm looking for a server side file plug-in to swap to a default image if a thumbnail is not present. Something like the following would be perfect for my calculated container field but I'm bit stymied on how to implement this using IWP.

Case(File_Exists(path_to_image);path_to_image;path_to_alternate_image)

Can someone point me to a plug-in that works with IWP?

Thanks.

Not sure you will find a plugin that can do that, as the web pages are rendered from pre defined files. You would have to edit those files with some script that can determine if the image is available or not.