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Features disappear when I Enable Time Animation in a web map

Question asked by on Sep 26, 2017

Hi.  I have a hosted feature layer with a date/time attribute field published from ArcGIS Pro.  In the ArcGIS Online web map, if I click to 'Enable Time Animation' on a layer, the features disappear from the map viewer.  If I don't click on 'Enable Time Animation' on all layers, the web map app (created in web app builder) displays a message stating 'No time-aware layers are visible.'  I don't understand why features disappear when I 'Enable Time Animation,' seems counter-intuitive. I can kind of understand why I see the other message in the web app map.  Any help would be appreciated.  Thank you in advance.