PR4100 Phone App access without Internet

I am wondering, if my phone App is able to access the PR4100 through wifi only connection.
My brief test show not. Cloud OS5 seems to use a server on the Internet to do authentication.
Please let me know if it is expected.
Thanks,

Hi @legendbb,

Please contact the WD Technical Support team for best assistance and troubleshooting:
https://support-en.wd.com/app/ask