: This is typically a hexadecimal hash or a unique identifier. It is often used by software to link a specific video file to its corresponding thumbnail in a cache folder.
: Programs like Premiere Pro or DaVinci Resolve create "peak files" or "thumbnail caches" with similar alphanumeric strings to manage project assets. 40489A9A Mp4 Thumbs jpg
These files are cache files. If you delete them, your device will simply regenerate them the next time you browse your folders. Deleting them is a common way to clear up "Other" or "System" storage space on mobile devices. : This is typically a hexadecimal hash or
: Many Android devices and apps (like WhatsApp or Telegram) generate these files in hidden folders (e.g., .thumbnails ) to speed up gallery scrolling. 40489A9A Mp4 Thumbs jpg