USB On-The-Go is a protocol that allows USB devices, such as tablets or smartphones, to operate as a host, allowing other USB devices, such as USB flash drives, digital cameras, mice, and keyboards, to be connected to them. It was first used in late 2001.
The Xiaomi Poco M4 Pro 5G has a USB Type-C 2.0 with OTG support. Enable this option from the phone settings and enjoy it.