I've encountered this problem before, and it's quite easy to solve. Next, I'll tell you how to operate it:

Tool: Redmi4 Version8..33

Step 1, this function requires "the latest version of WeChat 8..33 (click to download)", then find a friend who wants to send music on WeChat and click to enter. (as shown in the figure below)

Step 2, on the chat page, click+in the lower right corner to open more functions. (as shown in the figure below)

Step 3: Then, in its function page, find the music on the right and click to enter the function. (as shown in the figure below)

That's all the steps to solve it. If it's useful to you, remember to help me like it and pay attention to it ~