Reopen WPS and re-sign. You must put a small tick after signing, and then click OK, so that the handwritten signature will be sent out.

In the wps interface, find the document to be signed and click to enter the new interface. After entering the new interface, click the edit button on the upper left, and then click the tool icon on the lower left to pop up the window. After the pop-up window appears, pull the taskbar to the left, click the button of the brush, and then click the handwritten signature with your finger.