Saving documents to your SD Card in SwiftScan for Android:
This may sometimes happen and it depends on your device. Basically SwiftScan is only saving scans to locations which Android recognizes as external locations. This might or might not be a SD card.
For now you can't do something about it. We could - and we might do in the future - however, this would make the app and the infrastructure much more complex. Let us know if you have further questions in this direction!