Yeah, I noticed that this is the only way it works without serious performance issues
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I don't need to keep a copy of the image on disk, but I guess I could save it out to disk, and then once uploaded, delete it. It does sound better (and more optimised) than storing them in memory as the number of images could grow.
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Actually, no. You need to have that copy on disk because iPhone cannot keep in memory so much images. Two full-sized 2MPix photos is enough, 3 is a pain - iPhone will pelt you with didReceiveMemoryWarning trying to get some memory.
