I have a pi 3 model B+ and the official raspberry Pi PSU, and the official 7” touch screen. I’m running Raspbian with all the latest updates.
I have connected the display using a USB cable as documented on the raspberrypi.org site.
When I power up I get the underpowered lightning symbol.
What’s the right way to do this? Does using the jumper cables instead of the USB pass-through cable work more efficiently? Is there any other benefit to using them besides freeing up a port?