What determines which photos appear in the Panoramas album
I am trying to determine what dimensions a photo has to be to appear automatically in the Panoramas album. I have created what appear to me to be panoramic pictures, but only some appear in the Panoramas album. All my iPhone produced panoramas appear there, but only some of my cropped photos making me deduce that it might be the original size of the picture that determines whether it is pano picture or not.
I suppose the thing to try is crop a picture in an external editor and see whether they appear in the album.
Any other ideas?
iMac, OS X Yosemite (10.10.3), iPhone 6+, iPad Air, Apple TV 2