This is made possible by a new feature called "intelligent JPEG sharing," which shares JPEG scans all at once with apps (like Evernote) that support it, and one at a time with apps that work better that way (for example, the built-in Google Drive uploader with OCR, and Google Goggles).
The enhanced Drive uploader with thumbnails, a useful visual reminder when uploading a list of scans.
All announcements about Droid Scan 5.4.3:
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