The file you see in application message is something before applying the transformer (mentioned in  Routing address). So basically the file you see in the OUT folder is not identical to the file you obtain from application messages if your flow is with a transformer (In E-invoice flow we are using a transformer).

There is no way that you could view the file in out folder using IFS clients (Aurena or IEE) as this setup intended for integration purposes where its application facing  in most of the cases. How ever if your requirement is to view the file some how (not from out folder)

1. you could configure a different routing address with different transport protocol (Email for example)
2. if you want it for kind of debugging purposes you could get the xml from application message and you could obtain transformer xsl file by using the export option in solution manager→ setup IFS connect → transformers window and apply that transformer to the XML manually using a tool like notepad++