Scan Pro App requires full access to your Dropbox, Google Drive and other cloud services. Here's why:
Scan Pro App requests access to the whole folder of some cloud services such as Dropbox because it lets you choose any folder as the target folder to upload your scans.
You can also create new folders within Scan Pro App to upload your scans to. Without full access we wouldn't be able to offer you this functionality. In the beginning of Scan Pro App we started with limited access to just one folder called "Scan Pro App", but many users requested to pick their target location on their own.