IOS restrictions,must use HTTPS to connect a non-local WebDAV server
                    question above.But I can use WebDAV at my PC.I dont know whether 123pan can do this.
this is debug ID D250338960
                            this is debug ID D250338960
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You should find a different provider or use Zotero Storage.
iOS apps can make non-HTTPS connections to local servers. Non-HTTPS connections to remote servers require an exemption from Apple, and we don't request one, because there's no real reason to be using an insecure remote WebDAV server these days. In this case, the protections stopped an insecure connection that absolutely shouldn't have been made.