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Today, who's an iphone non't be able to load Pictures 360.
I'm not sure how i'd take 360 on an iphone but I did take some with the Insta360, saved to my 'phone. I can't yet see how to upload them to Street View app. It may be as I have saved the 360 images to my phone first.
I can load them without problems, (Iphone 7)
Are you using the Street view app?
Here the message after selecting "moves and connects" 2 spherical photos (added to the same map tabs)