Collector for ArcGIS (iOS) 10.2.7 fails to synchronize to hosted feature layers in Portal for ArcGIS 10.3. The failure occurs if the feature layer is uploaded from a zipped file geodatabase and the feature layer in Portal for ArcGIS 10.3 has a geodatabase (GDB) in the title. In addition, if the Data Store in Portal for ArcGIS 10.3 is hosting managed database, failure occurs.