I created a bunch of points and a few polygons offline. When I got back to WiFi, I tried to sync them, and got the message "Sync error: An error occurred while synchronizing edits." When I click Show Details, it says "Synctools service error.Could not service request."
I checked our web map just in case it was working, but it doesn't show any of the points that I collected.
I'm using Collector for ArcGIS version 18.0.3 on an Android tablet (ZenPad Z8s), android version 7.0. But I'm having this problem with multiple tablets.