Hey Jason, i have been testing with this functionality for quite a time now. The only way to create or mutate a record in a related table in ArcGIS online, is by using Collector for ArcGIS or ArcGIS pro. ArcMAP has the disadvantage making a replica of your data first before you can edit it and hope your sync will go right. If you want to visualize you records in a map you even have to simplify you data in a new feature layer. e.g. I have a asset with multiple recordings of problems that have to be solved. I want to show the mechanic a map with all the assets that have a specific problem. So i join the asset features with the info from the relation table and make a new layer. Now the mechanic can select a specific problem of his choice, show were he has to go and solve the problem. If anyone has a different solution i be very interested. Best regards, Richard Jansen
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