Its a reader which can download files with given QR code.
If you want to share your file with other, you can link the app with your Dropbox account.
This App can be work with File Sharer which is available at mac app store.
"File Sharer" link:
https://itunes.apple.com/tw/app/file-sharer/id1201300279?mt=12
Usage to share your file:
1) Open the file
2) Slide to left would show the QR Code
Usage to download via QR Code:
1) Press "Add" button on top right.
2) Scan QR code.
3) Download and read the file.
supported format: jpg, pdf, png
For more information, please visit our website. http://noahleft.github.io/PDF-Book