GEN3: How to define a Repeating Global Variable?

Hi all,

I'm building an integration and found it would be streamlined if i could used a repeating global variable to store a responses via data stitch too. However i cant get the global variable to recognise my collection as repeatable, I can see it was possible in gen2 via blogs but has anyone done this in gen3?

Breakdown on my scenario:

1. Create global Var as Object, and assign a collection node:

2. Then via data stitch, i go to actually assign the invoke response, it says it not a repeating element?

I could use ASSIGN operation instead of Append, even so my global var doesn't appear repeating, so cant be used in a for each loop later etc…