When exporting unknown documents you can face a problem that multi-page documents result in exporting each page as a separate document.
The reason for this behavior is usually because import is set to automatic.
With automatic import, FlexiCapture splits documents into individual pages and when each page does not match a document definition, it saves each individual page as a separate document.
In order to export unknown documents correctly, you need to set up your import as the following:
This simple solution works stably with various unknown documents.