If you have received this file as a document or a standard chat image, here is how you can save it permanently to your gallery: On Android
: This long prefix is likely a Unix timestamp (in milliseconds) used by a file manager or a cloud backup service (like Google Photos) to ensure a unique filename during a download or sync process.
: If the image was sent as a document, it may be hidden from your main gallery. Use a file manager like Files by Google to navigate to Internal Storage > Android > media > com.whatsapp > WhatsApp > Media > WhatsApp Images .
: You can share the file directly to Google Drive or Google Photos to download it on any other device. On iPhone (iOS)
: Open the specific chat, tap the image to open it in full screen, select the three-dot menu (⋮) in the top-right corner, and tap Save .