: A serial code generated by WhatsApp, indicating it was the 30th media file processed that day.
: Download 7-Zip . It’s free, open-source, and the gold standard for this format. VID-20180525-WA0030.7z
: This is the "wrapper." It’s a 7-Zip compressed archive, used to shrink the file size or bundle multiple videos together. Why Is It Compressed? : A serial code generated by WhatsApp, indicating