It is possible to save your scans in PDF format directly on your device without sharing to any other application.
In order to save a scan in PDF format please follow the steps:
1. Open the scan and tap Print symbol below.
2. Tap the blue line at the bottom of the screen showing the selected printer. Make sure you select "PDF Printer" option and tap the blue line once again.
3. Tap "Print" in the upper right corner of the screen - the document will be saved on your device in PDF format.
You can now find the document available in PDF format in the app's Library.