Storage & Scan Pro App: Why does Scan Pro App use so much Storage even though I deleted all of my documents?
A big amount of storage is taken up by the OCR-Language packs.
To get rid of those files as well, a simple reinstallation of Scan Pro App will remove them.
(ATTENTION: Please don't do this if you haven't uploaded all your important documents to a Cloud Service yet! This will delete all locally stored documents and there is no way to restore them again!)