How does the QNAP TS-874 expand storage?

The [QNAP TS](https://www.amazon.com/s?k=QNAP+TS&tag=wehavethat-20)-874 expands via USB 3.2 expansion enclosures like the TR-004, connected through its USB 3.2 Gen 1 ports. It’s a USB-only expansion path with no PCIe slot.