How to take image hash for ad creation?

Hi!

I’m trying to create the ads on Meta using Airtable.
I already set up a campaign, ad set, and am taking images/videos from Google Drive.

In my flow, I have 3-5 images/videos in one folder. The link to the folder is taken from Airtable.

I also added steps for uploading videos and images, and going to ad creatives.
From what I understand, I need to create the object which includes text, headline, image hash (for images), but I have a blocker on the step on how to take the image hash and overall create creative object.

For taking the image hash I tried to parse JSON which I receive after the step with image creation, but this is not working

error:

input:

output: