Can you post where those settings you mentioned are located? Couldn't find them in Mail or Accounts.There is an option under the sync settings in iOS 11 to allow it to be automatic when the phone is connected to a WiFi network and charging, the phone will get the emails like when "push" is enabled for Exchange, but only under this parameters, although sometimes I been receiving emails automatically even when the phone is not connected to the charger
Can you post where those settings you mentioned are located? Couldn't find them in Mail or Accounts.
Thank you! Found it. The kicker for me is having to have it on power to have this work. Wi-fi, no issue. But most of the day I do not have the phone plugged in.Settings -> Accounts and passwords -> Fetch new data
Make sure your Gmail account schedule is set to "Fetch"
At the bottom of the screen, under "Fetch" select "Automatically" instead of Every X minutes or Manually. When you select Automatically you will see a legend that reads as follows: "Your iPhone will fetch new data in the background only when on power and Wi-Fi."
That's it, hope this helps