Hi @apeers 
To be honest, I struggle to understand SmartSuite’s API.
I created a free trial and attempted something with there “All Brand Assets” template but found it difficult to navigate.
Looking at the “LinkedIn Ads” record on here:
It looks like this here is where we can find the 14 images:
From what I understand of their API documentation (the one you referenced here), you can then fetch each image based on its handle:
This is what I did here:
Using this custom formula:
I hope that helps. If you still get stuck, I strongly suggest you reach out to SmartSuite’s support team so they can help you navigate their API.