When a point feature service in ArcGIS Online is updated using a CSV file, the newly updated points do not appear in Map Viewer but appear in the attribute table.
This issue is non-reproducible in the most recent release of ArcGIS Online 7.1.
This issue may reproducible for services created before the ArcGIS Online 7.1 release (March 21st). These services must be republished to THE organization for the 'Append Data to Layer' process to function correctly again.
解决办法
Add the same CSV file to ArcMap.
Run the Display XY tool.
Export the points to a shapefile.
Compress and zip the file.
Select the file to append with a hosted feature service.
Both new point features and attribute information are displayed in ArcGIS Online Map Viewer.