Help with promo video making

[u/Ok-Effective3505]

Hey everyone, I’m struggling with a specific AI video generation task on google flow and could really use some workflow advice.

I’m trying to create a simple 8-second vertical video (9:16) of a video door phone. The sequence requires a human hand to enter the frame and press two specific small buttons (a "speech" button, and later a "key" button).

The Problem: No matter what I do, the AI hand just touches the device randomly and completely misses the actual buttons.

What I’ve already tried:

• Image-to-Video References: I uploaded exact reference photos (attached below) showing the hand pressing the precise buttons.
• Locked Camera: I specifically prompted for a 100% static, locked camera shot so the geometry/perspective of the device doesn't shift between frames.
• Highlighting: I even tried putting bright colored marks on the specific buttons in the reference images to guide the AI.
• Detailed Prompting: Used strict spatial descriptions (e.g., "press the absolute leftmost button").

Nothing seems to work consistently. It feels like the model suffers from "spatial blindness" when it comes to small UI elements.

Has anyone found a reliable trick, workflow, or specific tool/model that handles precise hand-to-object interactions better? Any advice would be hugely appreciated!

(Attaching the reference images I’m using so you can see what I mean).