Chinese Railway: 12306 does not have the function of changing seats online.

On July 16th, the "China Railway" WeChat public account published an article, in which a netizen shared a tutorial on how to "change seats online" using a third-party ticket purchasing platform. Is this really possible? The answer is no. The 12306 platform does not have the function to change seats online, and seat changes must be done through ticket exchanges, which third-party ticket purchasing platforms also facilitate.