AdWords cross-device conversions don’t:
track from mobile to desktop conversions; they only track desktop to mobile conversions
help advertisers understand the device that received the last ad click before the conversion
help advertisers track conversions that couldn’t be tracked before in AdWords since they were attributed to another non-AdWords channel like organic search or direct
track from desktop to mobile conversions; they only track mobile to desktop conversions
Explanation:
AdWords cross-device conversions don’t track from desktop to mobile conversions; they only track mobile to desktop conversions.
https://www.youtube.com/watch?v=xjUeDhvy_c4