[ncw96]

I don’t believe you can transfer files, but you can definitely charge an iPhone with an iPad if you use a USB-C to Lightning cable.

[jleahy]

But how do you charge an iPad using an iPhone?

[beefalo]

Some older usb-c devices would start charging based on order of plugging in. i.e. plug the phone side in first and the phone will start charging your iPad. Seems the defaults are smarter now and phones always prefer to receive power.