By storage, do you mean the document connected to Zotero, or the Zotero Data Directory? Assuming the latter, you should never put the Zotero Data Directory in cloud storage of any kind.
(This is a separate issue from the one raised at the top of this thread, please start a new discussion.)
(This is a separate issue from the one raised at the top of this thread, please start a new discussion.)
https://www.zotero.org/support/sync#alternative_syncing_solutions