Can't export to iPhone

[Coal Miki-Restall]

Although six or seven months ago I was able to export without issue, I can no longer export decks to iFlash Touch for iPhone. The message comes up that I should open iFlash Touch on my iOS device to continue, but despite having done this it doesn't progress past this point.

• My iMac and iPhone are on the same wireless network.
• At "Export", selecting the device from the pre-existing list doesn't work, and nor does selecting "iPhone, iPad or iPod Touch..." .
• iFlash and iFlash Touch are both up to date.

I'm guessing that the iOS 11 update may have messed things up...