How can I keep my Beestation online only as a local folder (Mac)?

I recently bought a Synology Beestation and have configured it to have a local folder in my Mac Finder. My goal is to use my Beestation as a media archive that I can access from my laptop and elsewhere. Due to storage limitations in my laptop I want that folder to be online only, so that I can see what I have but not have it downloaded in my laptop.

However, it seems that everything I add is stored locally by default, forcing me to manually place each file as online only through the "Free up space" option.

Is there any way to configure the Beestation to automatically online only? Can't seem to find the appropriate command in settings.

Thanks!