Just a little difficult to figure out, but it works perfectly!

I needed a way to transfer files from my cell-enabled iPhone with my WiFi only iPad when there was no WiFi around to use. This app using Bluetooth worked perfectly!

Use Open In in some other app to send the file to this app.
Open this app on both devices.
Select the file(s) you want to send and press the "Send to" icon in the top right corner to indicate you want to send the selected files via Bluetooth.
Select Receive on the receiving iDevice.
Confirm the devices on both devices to enable the connection.
After the transfer, use the "Send to" icon in the top right corner on the receiving device to send the files to the app where you really want to use them.

Enjoy!

Greig G about Bluetooth Share Center