How does Apple back up WeChat chat records when changing mobile phones?

First, open the settings, iCloud, and log in to iCloud on the old device;

Then find "Documents", confirm that the right side is open, and click "Back Up Now" after entering;

After the backup is completed, turn on the new device, connect to Wi-Fi (important), select "Restore from iCloud" in the next initialization interface, then log in as prompted and wait.

In addition, you can use iTunes for backup. Download the latest version of iTunes on the computer, connect the old and new mobile phones, back up the old device first, and then click the new device to resume the backup.