Web map link: http://arcg.is/1RnGLfr
Trying to sync offline edits (including a large number of photo attachments). How to resolve the Timed Out error? Thanks.
Be sure to vote for Sync Collector for ArcGIS via USB! It shouldn't be this hard to perform two-way sync with collector. ArcPad does it (which is going away), why not Collector?
If the service is coming from ArcGIS for Server, consider increasing the "Maximum time a client can use a service" .
Tuning and configuring services—Documentation (10.3 and 10.3.1) | ArcGIS for Server