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We don't always know when someone is planning to share a Google file with us ahead of time. However, if we are not expecting it, it is safer to contact the person (or, for important people, either their representative or the User Experience Team) to confirm that the file is legitimate. This holds true for unexpected links (Did a YouTube video remind someone of you, so they sent you the link? You could look up the video on YouTube, or give the person a call to double check.).
Where Can I Learn More?
A few sources for those looking at their online security include:
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