Your file store is configured under Administration > Configuration > File Store. You can point to a network location in one of two ways:
- By mapping a drive through the OS, and referring to that drive (e.g. X:\filestore)
- By referring to the full network path of the folder (e.g. \\servername\shared\filestore)
It is also important to ensure that Service Catalog will have appropriate permissions to the target folder. Double-check which user account is used to start the Service Catalog service on all nodes, and then ensure that this specific user has both read and write permissions on the file store's folder (if not Full Access permissions). If this user account lacks write permissions, the connection test may still 'succeed', though it will be unable to write to the file store.