PROBLEM
In ArcGIS Online Map Viewer or Map Viewer Classic, when attempting to apply a filter to a feature layer in a web map, the Filter option is not available, as shown in the images below.
In Map Viewer
In Map Viewer Classic
This issue occurs when the feature layer in the web map is not hosted on ArcGIS Online. For example, feature collections such as CSV files, shapefiles, or map notes added to the web map using the Add Content to Map option in Map Viewer Classic are not added as hosted feature layers. The Filter option is not supported for non-hosted layers. Refer to ArcGIS Online: Create filters for more information.
To resolve the issue, publish the file or layer as a hosted feature layer in ArcGIS Online.
In Map Viewer
The image below shows the Filter option is available in ArcGIS Online Map Viewer.
In Map Viewer Classic
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