On start Google Photos says that i need to upgrade. You can of course click no, but it is very pain to do it always. Do you know any method to disable this popup without upgrading apps ?
I got rooted device.
When you get the notification next time, long press it and you will get the Settings or the details option based on the version of Android running on your device. Once you select the option, you will be taken to the notification settings page of the app and from there you can choose to turn off the notification for that particular popup category or for the entire app.
Go to the settings Find the Google Photos app Disable background data