I'm aware of the Wii U needing a USB 3.0 cable with a Y-splitter to use external hard drives, but those are pretty uncommon in India. I found this on Amazon.in, but
Nintendo Wii Hard Drive(2tb) W/3.0 Usb Powered Enclosure!! Ask for Specifics. - Hard Drives | Facebook Marketplace | Facebook
Wii U All in One Stand - Console, Gamepad, USB HDD by Rich T | Download free STL model | Printables.com
Wii U USB Y Cable for Self-Powered External HDD issue - YouTube
Nintendo Wii U All in One Stand Organizer Center - Holds Console Gamepad USB HDD | eBay
USB Storage | Wild Man Ted
Using USB Storage with the Wii U - Guide | Nintendo Life
Amazon.com: MiniPro 2TB External USB 3.1 Portable Hard Drive for Nintendo Wii U : Electronics
Wii Hard Drive - Etsy
Amazon.com: Cable Matters Micro USB 3.0 to USB Splitter Cable (USB Y-Cable, USB Y Cable) 20 Inches : Electronics
Backup & Play Wii Games on a USB Drive! - USBLoader GX Tutorial - YouTube
Oyen Digital 1TB MiniPro USB 3.0 External U32-54-1000-MWII B&H