Solved! Go to Solution.
I noticed you said you loaded it up as a tiled service
To get the attribute table in ArcGIS Online, you will need to reload it to ArcGIS Online as a Feature Service
Once you have done this in AGOL add the data to an existing map/new map
Click on Content
in the Table of Contents
Click the small dropdown arrow next to the feature
Click Configure Popup
You can then select what information you want to popup when a user left clicks on the feature
Hope this helps
Regards
John