I believe that they support WebDav. https://www.zotero.org/support/kb/webdav_services https://www.zotero.org/support/kb/webdav_services You also have an optio

I believe that they support WebDav. https://www.zotero.org/support/kb/webdav_services https://www.zotero.org/support/kb/webdav_services You also have an option to use the Zotfile extension to sync with other services.