Onlyfans(4).mp4

This indicates that there are at least three other files named "OnlyFans.mp4" already sitting in your Downloads folder .

When you download multiple files with the same name, your web browser (like Chrome or Safari) automatically adds a number in parentheses to prevent overwriting the original file. OnlyFans(4).mp4

Since many clips on the platform don't have unique titles, bots often save them as [Platform Name]([Number]).mp4 . This indicates that there are at least three

Most files labeled this generically on public forums are "survey-ware"—they will ask you to complete a "human verification" survey that never actually gives you the file. Most files labeled this generically on public forums

You will often see these file names in "leaks" channels where automated bots dump content into a chat, leading to a long list of sequentially numbered files. Summary of Safety Tips