Tencent's official WeChat account "WeChat Pai" posted a post today, officially announcing a new feature for posting pictures in WeChat chat: everyone can try "merging and displaying after sending" pictures in WeChat. Now, when sending 3 or more pictures or videos, you can see "Merge and display after sending".
WeChat also stated that "the pictures sent out can be expanded or collapsed, and the form can be switched with one click. You can also save all the contents of the 'merged display' with one click, or forward it to other friends."