Hello,
1. The D200H does not natively support HDMI screen mirroring. Please refer to the product specifications—the C port operates under the standard USB 3.0 protocol.
2. This is normal behavior. The D200H functions as a docking station and must be directly connected to a computer's USB port. Once powered via PD (Power Delivery), third-party expansion docks can be connected to the D200H's USB ports for use.