I learned in this thread that AGOL's WebApp Builder and the hosted application templates do not support one-to-many tables ... yet. Imported File GeoDB relates do show up in the AGOL Web Map interface ("Show Related Records" link in attribute popup).
Could anyone give me some recommendations or any pointers on how I could implement one-to-many attribute table look-ups for point features in a custom AGOL app template?
Are there non-Esri AGOL app templates that do it already?