Files with this naming structure usually appear in the following scenarios:
: If this was a "View Once" photo, it would not typically be saved with this filename unless a screenshot was taken, which the sender may be notified of in some versions.
: WhatsApp allows users to Request account info, which generates a ZIP file containing account data and occasionally media thumbnails.
: This suffix typically indicates a duplicate file . If you saved the same image twice or received two copies with the same timestamp, your operating system adds this number to avoid overwriting the original file.