I just tried using the GoPro app to do a capture and viewed it on the iphone and I did not see the same issues I'm having processing the footage using Fusion Studio on my computer.

I'm having a terrible time with 360 cameras and video footage.  I also have a Samsung Gear 360 and processing the video files with their program results in a black rectangle right in the middle of the footage.

I'm having no luck with these cameras.