PROBLEM
In Portal for ArcGIS, ArcGIS Server feature layers are also known as referenced layers or registered layers. When attempting to export an ArcGIS Server feature layer from the layer's item details page, the Export Data option is unavailable.
This is by designed for an ArcGIS Server feature layer as it is stored in the ArcGIS Server of the ArcGIS Enterprise deployment. Refer to Portal for ArcGIS: ArcGIS Server feature layers for more information.
As a workaround, export the ArcGIS Server feature layer using the Extract Data tool in Portal for ArcGIS Map Viewer Classic.
Note: Ensure the Export Data and Enable Sync options are enabled when publishing the feature layer from ArcGIS Pro. Refer to ArcGIS Pro: Configure a web feature layer for more information.
Article ID: 000031069
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