I have the same issue as Lilly; I get messages saying various files can't be uploaded, or sometmes just "files 1-120 were not uploaded"; or files with the same names weren't uploaded. Sooner or later file numbers repeat, especially when you're uploading from several cameras. Since I'm not sure exactly which 120 of 1400 files weren't uploaded (and that was one camera, one day), I'm not sure how to figure out which I have and which I don't.... The two "official" answers provide no information that is applicable. When downloading, I only work through CC, on my desktop.
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