You can try the following solutions:
1. Modify the switching effect in PPT: after opening the PPT document, select the element to be changed under the animation menu, and then change the transition effect in the effect options.
2. Convert PPT to WPS-specific format: after opening the PPT document, select Save As under the File menu to save the PPT document in a format supported by WPS (such as WPS presentation). This way, when you open the PPT document in WPS, you can use the switching effect normally.
3. Update WPS version: If your WPS version is old, it is recommended to upgrade to the latest version. The new version of WPS may support more PPT switching effects and functions.
I hope these methods can help you solve the problem. Please feel free to let me know if you have any other questions or need further help.