Forms with Relationships not saving data

Hi again @ykethan, I tested this new feature and it works well. The only issue is when I select an item with a linked relationship, it doesn't save the form correctly. Here's a video reproducer:

https://github.com/aws-amplify/amplify-studio/assets/47440012/fa7f87c1-0944-4530-a69d-f490d636ace6

I checked the Dynamo tables and they also don't have the relationship data added.

I also accessed the older /content editor interface and that allows me to link table content to its related table.

![Uploading Screen Shot 2023-05-30 at 9.09.40 PM.png…]()

Any idea how to make it save the whole lot together?

_Originally posted by @DougalW in https://github.com/aws-amplify/amplify-studio/issues/924#issuecomment-1567834125_

Reproduce the relationship-selection case using the linked video, then trace the form-save flow and compare it with the older /content editor behavior. Confirm the relationship data is written to the Dynamo tables and remains linked after saving and reloading the form.

Written by the indexing model from the issue text.