Okay I did some digging. You order Huions USB C to USB C from their site or Amazon.

HUION Full-Featured USB-C to USB-C Cable Support USB3.1 GEN2 DP Signal for Graphic Drawing Tablet with Screen Kamvas 12/13/16(2021)/22/24/22 Plus/24 Plus/Pro 16 (4K)/Pro 16 Plus (4K)/Pro 24(4K), 3.2ft https://www.amazon.com/dp/B08CHGRL44/ref=cm_sw_r_apan_i_MC51M2QWVGE9SPT95W4M