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If you upload a file directly from the photo library, you previously had to copy the asset into a temporary file, which some picker libraries apparently don't support. Now the upload library supports that natively.
I did it by just copying the asset to a file. iOS had no support for directly uploading them. The best approach I found, and I researched a bunch, was from https://stackoverflow.com/questions/33278540/phasset-afnetworking-upload-multiple-videos
I took advantage of ObjC dispatch groups to make the actual implementation pretty straightforward.