Hi,
I attempted to configure zotero to sync attachments on my own webdav server. I got it to work on one computer, but on the other zotero claimed the adress was not a valid webdav address (see ID821383919)
Restarting zotero didn't help. At last I manually requested a sync and re-opened the preferences dialog. Only then zotero accepted the address.
Best regards
Paul van der Hulst