I have a file geodatabase, that contains a point feature, table, and relationship b/w the feature and table. I've uploaded that to Portal and have added that feature service to ArcMap.
I'm able to click on the point feature in ArcMap to view the related records that the field crews are capturing via Survey123.
An issue I'm having is not being able to see the table in the 'List By Source' view of the TOC in ArcMap. I can see the point feature, but can't access the table to change the default display field (currently is set to objectid, but want it to show the inspection date; so when I identify the point feature and drill down to the related table, I can see the records by inspection date).