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as u/ieatrazorz said, it’s an internal usb (most likely from the front panel). but to be more specific, it’s a 3.1 connector. if you don’t have a connector for it, chances are your board only supports 3.0 which will need an adapter like this
Please, please, please make a USB 3.1 motherboard header to USB 3.0 adapter. There is one on Amazon and Ebay, which I bought, but only 1/2 of the 3.0 ports will work with it, unlike a 3.0 header to 2.0 adapter (that are common everywhere) where it splits the 3.0 header into TWO 2.0 usb front panel ports. The only available cable mentioned above also only works on a select few motherboards for whatever reason. I could only get it to work on my Asus Rog Formula for 1/2 USB 3.0 ports, and it would not work at all on my Asus Prime z370.
The manual for the case is bit lacking so I'm still not sure what connector you are talking about?
For example here you see USB2 header, USB3 header and USB3 -> USB2 adapter.
This is a USB3 header to USB-C header adapter.
Based on the manual of that motherboard it has all 3 types of headers (page 14 on the english manual).
2x USB2 (F_USB1, F_USB2)
1x USB3 (F_U32)
1x USB-C (F_U32C)
I see things like that popping up on amazon, for example Chenyang USB 3.1 Front Panel Header naar USB 3.0 20Pin Header Extension Cable 20cm voor ASUS moederbord [link]