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What does the "preparing" step do when I upload a video on some website with my iPhone?
I have an iPhone running iOS 15. When I upload a larger video on some website, iOS spends a while "preparing" the video. What does this step do, and why is it necessary?
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The simple explanation is that the file stored on your phone isn't the file the website wants, nor the one your phone wants to share. What needs exchanging are the contents of the file; the picture or video, but not the file as it resides on the phone. Thus, you'll have format conversion, resizing, potential metadata removal, and compressing to carry out before the contents are shared with the website. The bigger and more complex the file is, the longer that process takes. That's why the user must wait, and is given a popup to explain the progress.
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