In the latest version 1.0.4 of Blux Camera, users are allowed to export either one by one or export multiple photos at one time to iPhone's camera roll.
To export photos to iPhone's camera roll, first swipe up from the viewfinder or tap the paralleled horizontal lines at the bottom to bring up the "Photo Album Menu".
To export photo one by one:
To export multiple photos to camera roll at one time, first go to the batch operation interface
And then tap the edit icon and export photos
You are also allowed to select all the photos to export (or delete)
A dialogue box, depicted below, will pop up when you tap the export button if you haven't turned the 'Blux Camera' switch to the 'On' position. To turn it on, go to your iPhone's 'Settings'--'Privacy'--'Photos'--'Blux Camera', and move the switch to the 'On' position. (NOTE: The 'Privacy' section in the iPhone's 'Settings' was added in IOS 6.0).
To enable photo access, follow the steps shown in the screenshot below.