Adafruit motor shield analog and output power pins are not working

Hi!
I have recently started building smart robot car .so , i bought motor shield for controlling motors.The whole build was successfull but when i started using analog pins and output power pins on shield when it is connected to EXT_PWR on motor shield they are not working .but if i connect dc jack to arduino directly additional to EXT_PWR those pins are working .i don’t know what is the reason

I require your help regarding a problem I’m encountering.

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Thank you so much in advance for your help!

There is a really interesting tutorial from adafruit:
https://learn.adafruit.com/adafruit-motor-shield/power-requirements