I uploaded my problem file with about 20 sample records. I used Streets as the basemap, and added a layer from file. When looking at the table in ArcGIS, all the coordinates are at two decimals. But on the map (when expanded), the points are separated. So somewhere, more decimal precision is known. But the display on the map is about 200 miles off the US west coast. Maybe that's where the truncated coordinates are located. I didn't actually check that. Certainly no streets out there. Same file works fine in the desktop software, so I know that the upload sort of / should work.
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