I've done this a few times and related the table set up the pop-ups and the forms. And when I go into field maps after its shared, I touch the table, and nothing is there. Its probably just a minor fix I hope but since I'm self-taught at this part I need some help. Pics below. I made the original table in arcgis pro and related it there.
Hi @Tooele_City ,
It might depend on the permissions set on the layer/table. If only update capabilities are there then you would need to modify the service/feature layer to enable 'Add' capabilities in order to add. If the capability is there but you cannot add then it could be a coding issue.
The way we have it set up is the hydrant information itself gets updated, and appends the record as a historical record to a related table using attribute rules in our portal.
I went back into the ArcGIS pro deleted the relate and did it again and now it works. This seems to be random.
Hosted services, if that is what you are using, can be finicky at times so reliability can be questionable.