Quicktime file downloaded before uploaded-- viewable?

If a video QuickTime file is downloaded before it is fully uploaded is it viewable in any way by the downloader?
Summary:
A sender began uploading a 700 meg motion video QuickTime movie file to an ftp site. The QuickTime definitely had motion prior to uploading. But the file hadn’t fully uploaded. The ftp stated that the file hadn’t uploaded.
The receiver downloaded that file earlier, deleted it from the server, opened it and concluded that it was the wrong file because it appeared to be a still with no motion.
The sender said that the file was only partially uploaded, and that the receiver had downloaded prematurely. The sender then verified the correct file and the motion of the QuickTime locally.
The receiver replied, it couldn’t be a partially uploaded QuickTime because you cannot open a QuickTime file until that file is completely uploaded.
So the question is-- can the QuickTime software open a partially uploaded QuickTime movie. If yes, it would create an error which made a QuickTime video file appear to be a still when opened?
Quicktime 7.0.3 Mac OS X (10.4.3)

Hey Kyn,
Thanks for your response. Format: None 720x486 Millions+ 29.97 Audio: None. Hard to say just looking at movie info if it was rendered with some streaming embed or not.
Good suggestion as far as zip archiving. This is less about next time and more about the specifics of what happened in this instance.
The question is-- can the QuickTime software open a partially uploaded QuickTime movie for partial viewing. Your answer was yes "sometimes it will play part of the file." Is there any official Apple documentation on this?

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