Identify post that iniciate the trigger

Hi everyone,

I'm currently using an automation in Manychat that's connected to all Instagram posts (not specific ones).
I'm trying to find a way to identify which specific post generated a lead.

Is there any method to either:

1. Dynamically retrieve the Instagram Post ID or some unique identifier inside the automation flow triggered by a comment or DM?

2. Or add a custom identifier (like a post number or slug) to the URL or UTM parameters, in a way that it’s passed into the flow and can be stored in a Custom User Field?

The goal is to track which post each lead came from, even when using the same automation across multiple posts.

Thanks in advance!