TS-462 Graphics card recognition ok on ZimaOS but not on QTS

Hello everyone,
To improve Plex, I tried installing an NVIDIA T400 on the PCIe X8 port. But QTS doesn’t see it. Even with a PCIe X16 to PCIe X8 adapter, QTS 5 still doesn’t see the Nvidia.
It’s not a hardware issue, but QNAP has restricted graphics card recognition. If I boot the TRS-462 with ZimaOS from a USB drive, the system instantly finds the T400. The same goes for Plex on ZimaOS, which immediately finds the Nvidia T400.

If I remove the USB drive and reboot on QTS, it finds nothing.

Why restrict the QTS system on this model since the PCIe port is fully compatible?

Does anyone have a tip for teaching QTS 5 how to recognize a graphics card on this TS-462?

No such restrictions that I know of…did you install the NVIDIA driver package ?

PCIe X8 port ???

The TS-462 has only a PCIe Gen 3 x 2 slot

There is no graphics card on the compatibility list