I've looked probably too hard at this point but am sure there must be an easy way to do this.
I do a lot of sampling. Our sampling locations are the same. What I would like to display in ArcGIS Online (be it a map or Web App) is a single point where you can click, and in the pop-up is a table of past results for the site.
It's almost like collector, but I want to see the history displayed, too. Let me know if you have any questions. Thanks!