There are 3 new things to discuss in the WhatsApp app. First is the ability to send any file type. Previously, the app was limited to sharing documents mostly from .pdf, .docx, .xlsx, and similar file extensions. As far as I can recall, it didn’t support .zip (although that was rumored), .apk, or even .jpg. You could technically share images, but they’d be compressed whereas sending the .jpg shares the entire file uncompressed. Now, all of these file types are shareable from the Attach > Document pop-up.
The second change is more aesthetic than functional, though it does significantly improve WhatsApp’s usability for media sharing. When someone sends or receives multiple images in bulk, they will be grouped into one bundle inside the chat instead of showing individually. It’s much more compact when you’re going through the conversation, and when opened, it displays all the full-sized images in succession. It’s a great solution for people and groups where a lot of media is shared in bulk.