If you are referring to combine all the scanned images (saved as pdf) into a single document, then that option is not available. However, you may visit this link to request this feature: Scan Android Feature Request and Bug Report Form
If you are referring to combine all the scanned images (saved as pdf) into a single document, then that option is not available. However, you may visit this link to request this feature: Scan Android Feature Request and Bug Report Form