Check the platform where you first heard of it (Discord, Reddit, or a specific forum). Often, users will post a "mirror" link in the comments if the original download is gone.
If you are searching for a specific viral video or a technical asset named "IMG_1692.MOV": Download IMG 1692 MOV
If there is no attachment, look for a link to iCloud, Google Drive, or WeTransfer . Click the link, and you should see a button that says "Download" or "Save to Device." Check the platform where you first heard of