Using an iPhone, how do I transfer videos I have shot from the DJI Go app to my iPhone ?

If you have enabled caching in the Go App, they will automatically be saved to your phone. What you are able to view in the Go App are those files, not of course the view when you are flying. But, as I always ask, why bother, the copy you get on your iPhone is very low resolution material, hardly worth the bother. The high quality versions are saved to the SD card in the aircraft.

You can press download button in the corner so your photos will be saved in your phone album