To enable WebDAV to handle paths with an & sign in the name, you need to update a registry key.
&
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET
VerificationCompatibility
DWORD
1
Configuring WebDAV Connector authentication
Configuring WebDAV Connector for LDAP authentication or single sign-on
Configuring WebDAV Connector for IIS
Configuring maximum size of WebDAV uploads
Configuring the WebDAV Connector
WebDAV client