ArcGIS Pro 3.1 will be compatible with ArcGIS Enterprise 11.1 and the documentation will be updated once ArcGIS Enterprise is released. Please refer to ArcGIS Pro and ArcGIS Enterprise compatibility matrix.
ArcGIS Pro 3.1 may be tested against file geodatabase. NOTE: Certain new capabilities are dependent on ArcGIS Enterprise 11.1 LRS service.
Ayan Palit | Principal Consultant Esri