Here are the USB adapters that have been tested and approved by Line 6 for the POD Express, and Pod Express Bass.
iOS devices - iPhone, iPad
The POD Express will require the Apple branded adapter if it's USB-C to Lightning with your iPhone, or iPad.
Regular USB-C To Lightning cable will not suffice, the adapter is needed to connect.
Newer iPhone/iPad devices that have USB-C can use a regular straight USB-C cable. (USB-C to USB-C)
Apple branded adapters for lightning connections:
Lightning to USB-C Adapter
https://www.apple.com/shop/product/mw5l3am/a/usb-c-to-usb-adapter
Lightning to USB 3 Camera Adapter
https://www.apple.com/shop/product/mx5j3am/a/lightning-to-usb-3-camera-adapter
USB-C to USB-C is the best style of cable for Mac OS, or Windows 10, and 11 connections.