A "source" file is usually large. If the file is only a few KB, it might be a shortcut or a corrupted download rather than the actual video.
If you're suspicious of the origin, open it in a secure media player like VLC rather than a web browser. Download File 5f62d38f252b86fce1be2_source.mp4
Right-click the file (Windows: Properties > Details; Mac: Get Info) to see if there are tags for "Title," "Author," or "Copyright." A "source" file is usually large
_source indicates this is likely the original, uncompressed, or highest-quality version of the video before any transcoding or resizing. 🛠️ Common Uses Download File 5f62d38f252b86fce1be2_source.mp4
A background video or hero asset for a website.