Gmail not syncing across all of my android devices.

[Rumblee1]

Hi, I've gone to the Google help page and have all settings set accordingly to what they say. Yet when I go to all mail on one device, it only goes up to April 2016. Another only goes up to March. I have a samsung galaxy S7 edge, ZTE axon 7, and an asus zenpad 3s 10. The only device that seems to be dead on is the S7 EDGE. Thank you

 

[anon(238680)]

Gmail has, at least on my S8, a setting to tell it how much past email to sync. I would take a look at that, as it would be device specific, which would appear to match your issue.