To enable iCloud
Then open Scanner Pro settings and toggle on Use iCloud.
To turn on iCloud Drive, go to settings and enable Share with iCloud Drive toggle. This will enable you to share files from Scanner Pro to other apps and make them visible in Scanner Pro on other devices.
To upload the scan manually to iCloud, open the scan, tap Share and pick iCloud Export/Save to Files (limitation: one scan per time).
In case you experience difficulties with iCloud Drive upload, please contact our Support team.