Tom, thanks for the explanation of the orientation issue. Do you know if there's any way to fix it? It does seem to be that Windows isn't reading the data correctly, as I assume that the Dropbox app on my phone isn't doing anything to the videos, just uploading them. The videos appear correctly on my phone, but when they get viewed in Windows 7 they're all upside down. I haven't seen a single suggestion in my searching for how to fix the issue, other than opening each video in an editor, rotating it, and saving a new video. That's insane.
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Matt