Such as Vimeo, Wistia, or custom Amazon S3 buckets, where uploaded files are renamed to random alphanumeric strings for storage.
Where did you find this filename? (e.g., a specific link, a document, an email). 5f9c353b7b08b656f48d6_720p-SucSPHlC.mp4
Without more context, it is not possible to identify the specific video content or the "paper" it refers to. Such as Vimeo, Wistia, or custom Amazon S3