Offline working in Zoho Creator portal

Offline working in Zoho Creator portal

Zoho's help says that offline working is only available in the Creator mobile app and not in the portal app.  But I can see offline options in the portal app too and it seems to work when I test it.

My portal users are often in areas where there is poor mobile signal and no wifi, potentially for days at a time.

Has anyone had experience of using offline working in this scenario?  Does it work reliably?