Samsung does not provide a public web interface for browsing the FUS. Instead, access is managed through official and community-developed tools that query the server's API. Official Methods
samfusdl is an unofficial tool for downloading firmware images from Samsung's FUS (firmware update service). 4 ways to update a software - Samsung Members Community samsung fus server
You might wonder, “Why not just wait for the OTA notification?” Advanced users access the FUS server directly for four primary reasons: Samsung does not provide a public web interface