I have loaded SD on my I Phone 4S as a back up to up to my I Pad mini. All works fine, given small screen size, but auto rotation feature does not seem to work and so SD only available in portrait mode. I have rebooted the I Phone to no avail. Is there a setting to enable the auto rotate feature?

SkyDemon for iPhone only support portrait orientation in the current release. We will likely add support for landscape orientation in a future release.