This link that can directly copy the historical message can be placed in the custom menu of the subscription number. The specific steps are as follows:

First open the subscription number and click the icon in the upper right corner.

2. Click "View Historical Messages" at the bottom of the page.

3. Click the three dot icons in the upper right corner and select "Copy Link".

Fourth, put the copied link in the custom menu in the background of WeChat official account and publish it.