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At least one of the 'workstation' or 'http' or 'https' services has to be defined in the 'Avahi' for this local datastore feature to work.
Local DataStore Protocol Scheme
Since the EVE-OS 'downloader' module uses IP address in URL to fetch the images from the local Datastore, and also the datastore is internal to the device and under control by the user/enterprise, the protocol scheme should be HTTP. The downloaded images are verified by the datastore specified hash value for integrity of the image. In the case the HTTPS scheme needs to be used for the local datastore, the user needs to make sure the local datastore App interface IP address is statically assigned on the Network Instance configuration (so it will not change after reboot, etc.) and also the certificate's 'subjectAltName' needs to include this interface IP address, and the certificate chain is included in the local datastore configuration for EVE-OS to verify during downloading operation.