If it doesn’t work out of the box, then you may need to install drivers. There’s download links on the product page at:
https://www.club-3d.com/en/detail/2467/usb_3.2_gen1_type_a_to_rj45_2.5gbps_adapter_m-f/
I don’t know. I have zero experience with Synology NAS. Maybe trying googling for a solution.
https://www.reddit.com/r/synology/comments/13kipn5/is_there_25gbe_usb_ethernet_adapter_that_works/
https://github.com/bb-qq/r8152

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