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This naming convention—a long hexadecimal string followed by "_source"—is typically used for internal file management by content delivery networks (CDNs), social media platforms (like Reddit or Discord), or cloud storage services to index uploaded content.
If you have more context, like where you found this file or a description of what's in it, I might be able to help you track down the original creator or more details. 5f3ed947c2cec8e55655e_source.mp4