Missing Multiple Cloud Storage in Home Tab of Acrobat Reader DC

I find after upgrade one version of Adobe Reader DC, the document cloud button in Home Tab disappear, also it disappear in toolbar. Originally there is one button to upload local document to cloud, now it is missing. Also originally I can access other Cloud Storage, but now only OneDrive Storage is available. My location is at China Mainland. My version is Acrobat Reader DC is 2020.012.20048, it is a macOS version. I also tried on windows platform version, it seems the same. Currently only the mobile version in Android still remain the button.

Whether this is due to different region restriction for the Cloud Storage Option? Or it's due to some bug?