When I plug in the "iPad (6th generation) Wi-Fi + Cellular" to the MacBook, it always says "unlock this iPad to use accessories." What it doesn't say is that it also won't charge until I do so. Took me several times to figure this out. (Has a cover, so I didn't see the message.)
But the iPhone 7+ doesn't do that. Both have IOS 12.4, so there must be a setting that I am not recognizing. Or are there distinct unlabeled "flavors" of IOS?
How can I make it start charging as soon as plugged in, even if screen is locked?