Recently, I synced my attachments between my Ubuntu and Windows with WebDAV. However, I have a big problem. It worked well in my Ubuntu, but all my files were removed when I used Zotero in Windows! In WebDAV, I still can find those files and directories, but they disappeared in the "Zotero/storage" of Windows.
Even though I copied the "storage" from Ubuntu to Windows, they were removed as long as I opened Zotero in Windows.