DELMIA Apriso - Documents preview on a 3 Nodes installation

Hello,

I need help on a 3 Nodes Apriso installation (App Server, Web Server, DB Server). I don't know if it's a configuration problem but every time I try to preview a loaded document in Document Maintenance i get the same error message : "Could not find file on server: [ServerPath]/filename.xxx".

When I create the translation the file is correctly loaded in the Documents folder on the App Server. But when I try to preview it, it's seems to search it on the Web Server instead. If I copy manually the file on the Web Server Document folder I'm able to see the preview but it's not a valid workaround.

I've tried to modify the CentralConfiguration.xml files on both machine on these keys but I haven't fixed the problem:

The Documents folder on the AppServer is actually shared and reachable from the WebServer.

Any suggestions?