External hard drive not working with iPad or iPhone using iPadOS or iOS 13?
rts Lightning to USB Camera Adapter USB hub 3.0 OTG Data Sync Cable Adapter High Speed Data Transfer Connector Compatible with iPhone/iPad,USB Female Supports Connect Card Reader,U Disk,Keyboard,Mouse, Flash Pen Drive-Plug&Play :
How to Connect USB to iPad: 5 Steps (with Pictures) - wikiHow
attaching external drive feature - Apple Community
External usb drives on lightning iPads (a… - Apple Community