Creating custom packs / button actions

I am trying to create a pretty simple app and having some issues with button forms.

I have a table that with two one-to-many columns and created a “button” form to make a new record. There are two options for displaying the one-to-many columns in the form - as a table, or as a single field. Both allow me to enable “quick adding of new items” however there doesn’t actually seem to be a way to do this in the single field mode - there’s no + button and typing something new and hitting enter just gets ignored.

I would love to be able to add a button on the form to bring up another form for adding new items to that one-to-many relationship, but that doesn’t seem possible (which seems like a more fundamental issue).

Also when I have the table view enabled and choose an item, it just crashes the mobile app (internal coda “something went wrong page”).

And there doesn’t seem to be a way to make columns required, and blank rows get added every time I look at the form.