Android System Updates via WiFi Only?

[AC Question]

I have a new Nexus 5X running Android 6 (Marshmallow) and noticed today that it had downloaded a system update via my cellular network (4G). This eats up a lot of my data and wanted to allow allow the system update via WiFi (similar as I do with apps), but I do not see an option for this. Is there a setting somewhere to only allow the system updates to be downloaded when on WiFi?

Regards,
Nelson

 

[PhiPsi32]

The update was probably the November security patch. It's very small (~3MB). The OS upgrades probably won't auto download on mobile data. And I haven't seen a setting for this. The 5X is also my first Nexus, but I'm not worried about this.

 

[sambartle_uk]

The size depends which updates you had before..
For example my UK 5x just got the November update (from MDA89E to MDB08L) which was 45MB

They do download over 3G/4G though.. I used to do that all the time on the Nexus 4

 

[MetalTaylor]

I've never had that issue-- hopefully it's not too expensive for you!