Consoles with a 1TB internal drive can run out of space fast ... For a SATA SSD, you'll need to arrange a SATA-to-USB enclosure, and for an NVMe SSD, an M.2 NVMe-to-USB enclosure to connect ...
The enclosure that he’s using is meant for a 5.25″ optical drive. It comes with a USB to SATA converter which is how he connects the hard drive to the Raspberry Pi serving the files.