Google Drive Realtime Api Offline And Sync Support

I want to build a mobile web app with transparent offline and sync support for collaborative persistent data. I am considering using Google Drive Realtime API for the backend. How

Solution 1:

There is no explicit offline support. The API will deal well with flaky internet connections, but you can't load or create entirely offline.

I'm not sure what you mean by sync support, but if you have an internet connection it will automatically sync changes from collaborators and persist them on the server.