If you are unable to open the file due to the unusual extension: Vid 20181003 131635-8m4v
Uploads to Google Photos or OneDrive where the original metadata is preserved in the title.
Shared clips on platforms like WhatsApp or Telegram, though these apps usually strip original filenames in favor of their own internal naming conventions. Troubleshooting & Access If you are unable to open the file
A common video container format developed by Apple, similar to MP4.
Try changing the .8m4v suffix to a standard .mp4 or .m4v . Vid 20181003 131635-8m4v
The suffix "-8m4v" appears to be a truncated or modified version of a standard video container.