We created a map in ArcGIS Pro and configured custom attribute displays for some features, one of which pulls data from a related table. The popup works great in Pro. We published the map through portal and the popups work great in the web map. Once we get the map onto Collector, though, the fields that show attributes from the related table are blank, even though it displayed correctly in Pro and the web map. If you scroll down past all the attributes you can open up the related record, so I know it's there, but the info just doesn't get pulled to the popup in Collector. What's going on?