How the changes in the WebDocument are updated and saved

The document is uploaded to the IceWarp.
When the document is opened and displayed, it is uploaded to the WD cluster.
The changes are made in the document by the user.
The message All changes saved is displayed, which means, that the changes are saved on the WD cluster.
When the document is closed or automatically every 5 minutes if the document remains opened, the updated document with all new changes, is forwarded back to the IceWarp.
When the document is opened again, all the changes are displayed.